156040681 has 2 divisors, whose sum is σ = 156040682. Its totient is φ = 156040680.

The previous prime is 156040631. The next prime is 156040727. The reversal of 156040681 is 186040651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82355625 + 73685056 = 9075^2 + 8584^2 .

It is an emirp because it is prime and its reverse (186040651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156040681 - 2⁹ = 156040169 is a prime.

It is a super-2 number, since 2×156040681² = 48697388253887522, which contains 22 as substring.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (156040601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78020340 + 78020341.

It is an arithmetic number, because the mean of its divisors is an integer number (78020341).

Almost surely, 2^156040681 is an apocalyptic number.

It is an amenable number.

156040681 is a deficient number, since it is larger than the sum of its proper divisors (1).

156040681 is an equidigital number, since it uses as much as digits as its factorization.

156040681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 156040681 is about 12491.6244339958. The cubic root of 156040681 is about 538.3680508324.

The spelling of 156040681 in words is "one hundred fifty-six million, forty thousand, six hundred eighty-one".