156261431 has 2 divisors, whose sum is σ = 156261432. Its totient is φ = 156261430.

The previous prime is 156261401. The next prime is 156261461. The reversal of 156261431 is 134162651.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (156261401) and next prime (156261461).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156261431 is a prime.

It is a super-2 number, since 2×156261431² = 48835269636335522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 156261394 and 156261403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156261401) 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 as a sum of consecutive naturals, namely, 78130715 + 78130716.

It is an arithmetic number, because the mean of its divisors is an integer number (78130716).

Almost surely, 2^156261431 is an apocalyptic number.

156261431 is a deficient number, since it is larger than the sum of its proper divisors (1).

156261431 is an equidigital number, since it uses as much as digits as its factorization.

156261431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 156261431 is about 12500.4572316376. The cubic root of 156261431 is about 538.6218067706.

The spelling of 156261431 in words is "one hundred fifty-six million, two hundred sixty-one thousand, four hundred thirty-one".