1219072681 has 4 divisors (see below), whose sum is σ = 1261109700. Its totient is φ = 1177035664.

The previous prime is 1219072667. The next prime is 1219072693. The reversal of 1219072681 is 1862709121.

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 440160400 + 778912281 = 20980^2 + 27909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219072681 - 2¹³ = 1219064489 is a prime.

It is a super-2 number, since 2×1219072681² = 2972276403121055522, 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 1219072681.

It is not an unprimeable number, because it can be changed into a prime (1219072081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21018466 + ... + 21018523.

It is an arithmetic number, because the mean of its divisors is an integer number (315277425).

Almost surely, 2^1219072681 is an apocalyptic number.

It is an amenable number.

1219072681 is a deficient number, since it is larger than the sum of its proper divisors (42037019).

1219072681 is an equidigital number, since it uses as much as digits as its factorization.

1219072681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42037018.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1219072681 is about 34915.2213368325. The cubic root of 1219072681 is about 1068.2589325863.

The spelling of 1219072681 in words is "one billion, two hundred nineteen million, seventy-two thousand, six hundred eighty-one".