156411561 has 4 divisors (see below), whose sum is σ = 208548752. Its totient is φ = 104274372.

The previous prime is 156411527. The next prime is 156411571. The reversal of 156411561 is 165114651.

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 not a de Polignac number, because 156411561 - 2⁹ = 156411049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156411571) 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, 26068591 + ... + 26068596.

It is an arithmetic number, because the mean of its divisors is an integer number (52137188).

Almost surely, 2^156411561 is an apocalyptic number.

It is an amenable number.

156411561 is a deficient number, since it is larger than the sum of its proper divisors (52137191).

156411561 is an equidigital number, since it uses as much as digits as its factorization.

156411561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52137190.

The product of its digits is 3600, while the sum is 30.

The square root of 156411561 is about 12506.4607703379. The cubic root of 156411561 is about 538.7942472941.

The spelling of 156411561 in words is "one hundred fifty-six million, four hundred eleven thousand, five hundred sixty-one".