156258961 has 4 divisors (see below), whose sum is σ = 156537072. Its totient is φ = 155980852.

The previous prime is 156258959. The next prime is 156258967. The reversal of 156258961 is 169852651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169852651 = 53 ⋅3204767.

It is a cyclic number.

It is not a de Polignac number, because 156258961 - 2¹ = 156258959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156258967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138211 + ... + 139336.

It is an arithmetic number, because the mean of its divisors is an integer number (39134268).

Almost surely, 2^156258961 is an apocalyptic number.

It is an amenable number.

156258961 is a deficient number, since it is larger than the sum of its proper divisors (278111).

156258961 is an equidigital number, since it uses as much as digits as its factorization.

156258961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278110.

The product of its digits is 129600, while the sum is 43.

The square root of 156258961 is about 12500.3584348610. The cubic root of 156258961 is about 538.6189687854.

The spelling of 156258961 in words is "one hundred fifty-six million, two hundred fifty-eight thousand, nine hundred sixty-one".