156423431 has 2 divisors, whose sum is σ = 156423432. Its totient is φ = 156423430.

The previous prime is 156423413. The next prime is 156423469. The reversal of 156423431 is 134324651.

Together with previous prime (156423413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 156423431 - 2⁶ = 156423367 is a prime.

It is a super-2 number, since 2×156423431² = 48936579531623522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 156423394 and 156423403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156423401) 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, 78211715 + 78211716.

It is an arithmetic number, because the mean of its divisors is an integer number (78211716).

Almost surely, 2^156423431 is an apocalyptic number.

156423431 is a deficient number, since it is larger than the sum of its proper divisors (1).

156423431 is an equidigital number, since it uses as much as digits as its factorization.

156423431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 156423431 is about 12506.9353160556. The cubic root of 156423431 is about 538.8078765635.

The spelling of 156423431 in words is "one hundred fifty-six million, four hundred twenty-three thousand, four hundred thirty-one".