1423747717681 has 3 divisors (see below), whose sum is σ = 1423748910891. Its totient is φ = 1423746524472.

The previous prime is 1423747717633. The next prime is 1423747717687. The reversal of 1423747717681 is 1867177473241.

The square root of 1423747717681 is 1193209.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 683666039281 + 740081678400 = 826841^2 + 860280^2 .

It is not a de Polignac number, because 1423747717681 - 2⁹ = 1423747717169 is a prime.

It is a super-2 number, since 2×1423747717681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1423747717687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 596605 + ... + 1789813.

It is an arithmetic number, because the mean of its divisors is an integer number (474582970297).

Almost surely, 2^{1423747717681} is an apocalyptic number.

1423747717681 is the 1193209-th square number.

1423747717681 is the 596605-th centered octagonal number.

It is an amenable number.

1423747717681 is a deficient number, since it is larger than the sum of its proper divisors (1193210).

1423747717681 is an frugal number, since it uses more digits than its factorization.

1423747717681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386418 (or 1193209 counting only the distinct ones).

The product of its digits is 11063808, while the sum is 58.

The spelling of 1423747717681 in words is "one trillion, four hundred twenty-three billion, seven hundred forty-seven million, seven hundred seventeen thousand, six hundred eighty-one".