1447213681 has 4 divisors (see below), whose sum is σ = 1455579252. Its totient is φ = 1438848112.

The previous prime is 1447213643. The next prime is 1447213699. The reversal of 1447213681 is 1863127441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 562448656 + 884765025 = 23716^2 + 29745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1447213681 - 2⁹ = 1447213169 is a prime.

It is a super-2 number, since 2×1447213681² = 4188854876947139522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1447213681.

It is not an unprimeable number, because it can be changed into a prime (1447213631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4182526 + ... + 4182871.

It is an arithmetic number, because the mean of its divisors is an integer number (363894813).

Almost surely, 2^1447213681 is an apocalyptic number.

It is an amenable number.

1447213681 is a deficient number, since it is larger than the sum of its proper divisors (8365571).

1447213681 is an equidigital number, since it uses as much as digits as its factorization.

1447213681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8365570.

The product of its digits is 32256, while the sum is 37.

The square root of 1447213681 is about 38042.2617755569. The cubic root of 1447213681 is about 1131.1257429285.

The spelling of 1447213681 in words is "one billion, four hundred forty-seven million, two hundred thirteen thousand, six hundred eighty-one".