156117801 has 16 divisors (see below), whose sum is σ = 238132224. Its totient is φ = 89120784.

The previous prime is 156117751. The next prime is 156117803. The reversal of 156117801 is 108711651.

It is not a de Polignac number, because 156117801 - 2¹¹ = 156115753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156117803) 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 15 ways as a sum of consecutive naturals, for example, 21796 + ... + 28058.

It is an arithmetic number, because the mean of its divisors is an integer number (14883264).

Almost surely, 2^156117801 is an apocalyptic number.

It is an amenable number.

156117801 is a deficient number, since it is larger than the sum of its proper divisors (82014423).

156117801 is a wasteful number, since it uses less digits than its factorization.

156117801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7460.

The product of its (nonzero) digits is 1680, while the sum is 30.

The square root of 156117801 is about 12494.7109210257. The cubic root of 156117801 is about 538.4567287885.

The spelling of 156117801 in words is "one hundred fifty-six million, one hundred seventeen thousand, eight hundred one".