156345961 has 2 divisors, whose sum is σ = 156345962. Its totient is φ = 156345960.

The previous prime is 156345947. The next prime is 156346007. The reversal of 156345961 is 169543651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137475625 + 18870336 = 11725^2 + 4344^2 .

It is a cyclic number.

It is not a de Polignac number, because 156345961 - 2¹⁵ = 156313193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156345941) 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, 78172980 + 78172981.

It is an arithmetic number, because the mean of its divisors is an integer number (78172981).

Almost surely, 2^156345961 is an apocalyptic number.

It is an amenable number.

156345961 is a deficient number, since it is larger than the sum of its proper divisors (1).

156345961 is an equidigital number, since it uses as much as digits as its factorization.

156345961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 156345961 is about 12503.8378508360. The cubic root of 156345961 is about 538.7189121870.

It can be divided in two parts, 1563 and 45961, that added together give a square (47524 = 218²).

The spelling of 156345961 in words is "one hundred fifty-six million, three hundred forty-five thousand, nine hundred sixty-one".