156061561 has 4 divisors (see below), whose sum is σ = 156148992. Its totient is φ = 155974132.

The previous prime is 156061531. The next prime is 156061603. The reversal of 156061561 is 165160651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156061561 - 2¹³ = 156053369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156061501) 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, 40981 + ... + 44626.

It is an arithmetic number, because the mean of its divisors is an integer number (39037248).

Almost surely, 2^156061561 is an apocalyptic number.

It is an amenable number.

156061561 is a deficient number, since it is larger than the sum of its proper divisors (87431).

156061561 is an equidigital number, since it uses as much as digits as its factorization.

156061561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87430.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 156061561 is about 12492.4601660362. The cubic root of 156061561 is about 538.3920629970.

The spelling of 156061561 in words is "one hundred fifty-six million, sixty-one thousand, five hundred sixty-one".