156011561 has 8 divisors (see below), whose sum is σ = 166598400. Its totient is φ = 145771920.

The previous prime is 156011549. The next prime is 156011563. The reversal of 156011561 is 165110651.

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

It is a de Polignac number, because none of the positive numbers 2^k-156011561 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 156011561.

It is not an unprimeable number, because it can be changed into a prime (156011563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85871 + ... + 87668.

It is an arithmetic number, because the mean of its divisors is an integer number (20824800).

Almost surely, 2^156011561 is an apocalyptic number.

It is an amenable number.

156011561 is a deficient number, since it is larger than the sum of its proper divisors (10586839).

156011561 is a wasteful number, since it uses less digits than its factorization.

156011561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173599.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 156011561 is about 12490.4587986190. The cubic root of 156011561 is about 538.3345590258.

The spelling of 156011561 in words is "one hundred fifty-six million, eleven thousand, five hundred sixty-one".