156420331 has 8 divisors (see below), whose sum is σ = 167760720. Its totient is φ = 145390752.

The previous prime is 156420317. The next prime is 156420337. The reversal of 156420331 is 133024651.

156420331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156420331 is a prime.

It is a super-2 number, since 2×156420331² = 48934639900299122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156420296 and 156420305.

It is not an unprimeable number, because it can be changed into a prime (156420337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76660 + ... + 78673.

It is an arithmetic number, because the mean of its divisors is an integer number (20970090).

Almost surely, 2^156420331 is an apocalyptic number.

156420331 is a deficient number, since it is larger than the sum of its proper divisors (11340389).

156420331 is a wasteful number, since it uses less digits than its factorization.

156420331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155405.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 156420331 is about 12506.8113842018. The cubic root of 156420331 is about 538.8043171747.

Adding to 156420331 its reverse (133024651), we get a palindrome (289444982).

The spelling of 156420331 in words is "one hundred fifty-six million, four hundred twenty thousand, three hundred thirty-one".