156218401 has 4 divisors (see below), whose sum is σ = 159165972. Its totient is φ = 153270832.

The previous prime is 156218353. The next prime is 156218431. The reversal of 156218401 is 104812651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104812651 = 6047 ⋅17333.

It can be written as a sum of positive squares in 2 ways, for example, as 94187025 + 62031376 = 9705^2 + 7876^2 .

It is a cyclic number.

It is not a de Polignac number, because 156218401 - 2¹⁵ = 156185633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 156218401.

It is not an unprimeable number, because it can be changed into a prime (156218431) 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 in 3 ways as a sum of consecutive naturals, for example, 1473706 + ... + 1473811.

It is an arithmetic number, because the mean of its divisors is an integer number (39791493).

Almost surely, 2^156218401 is an apocalyptic number.

It is an amenable number.

156218401 is a deficient number, since it is larger than the sum of its proper divisors (2947571).

156218401 is an equidigital number, since it uses as much as digits as its factorization.

156218401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947570.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 156218401 is about 12498.7359760897. The cubic root of 156218401 is about 538.5723618032.

The spelling of 156218401 in words is "one hundred fifty-six million, two hundred eighteen thousand, four hundred one".