156855961 has 4 divisors (see below), whose sum is σ = 157093924. Its totient is φ = 156618000.

The previous prime is 156855947. The next prime is 156856009. The reversal of 156855961 is 169558651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106729561 + 50126400 = 10331^2 + 7080^2 .

It is a cyclic number.

It is not a de Polignac number, because 156855961 - 2⁹ = 156855449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156855761) 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, 117990 + ... + 119311.

It is an arithmetic number, because the mean of its divisors is an integer number (39273481).

Almost surely, 2^156855961 is an apocalyptic number.

It is an amenable number.

156855961 is a deficient number, since it is larger than the sum of its proper divisors (237963).

156855961 is an equidigital number, since it uses as much as digits as its factorization.

156855961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237962.

The product of its digits is 324000, while the sum is 46.

The square root of 156855961 is about 12524.2149853793. The cubic root of 156855961 is about 539.3040428438.

The spelling of 156855961 in words is "one hundred fifty-six million, eight hundred fifty-five thousand, nine hundred sixty-one".