156338561 has 4 divisors (see below), whose sum is σ = 156528432. Its totient is φ = 156148692.

The previous prime is 156338527. The next prime is 156338587. The reversal of 156338561 is 165833651.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165833651 = 2531 ⋅65521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156338561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156338261) 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, 93695 + ... + 95348.

It is an arithmetic number, because the mean of its divisors is an integer number (39132108).

Almost surely, 2^156338561 is an apocalyptic number.

It is an amenable number.

156338561 is a deficient number, since it is larger than the sum of its proper divisors (189871).

156338561 is an equidigital number, since it uses as much as digits as its factorization.

156338561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189870.

The product of its digits is 64800, while the sum is 38.

The square root of 156338561 is about 12503.5419381870. The cubic root of 156338561 is about 538.7104126969.

The spelling of 156338561 in words is "one hundred fifty-six million, three hundred thirty-eight thousand, five hundred sixty-one".