156097561 has 8 divisors (see below), whose sum is σ = 163343304. Its totient is φ = 149011200.

The previous prime is 156097549. The next prime is 156097567. The reversal of 156097561 is 165790651.

156097561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17799961 + 138297600 = 4219^2 + 11760^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 156097561 - 2¹³ = 156089369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156097567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37840 + ... + 41761.

It is an arithmetic number, because the mean of its divisors is an integer number (20417913).

Almost surely, 2^156097561 is an apocalyptic number.

It is an amenable number.

156097561 is a deficient number, since it is larger than the sum of its proper divisors (7245743).

156097561 is an equidigital number, since it uses as much as digits as its factorization.

156097561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79691.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 156097561 is about 12493.9009520646. The cubic root of 156097561 is about 538.4334582515.

The spelling of 156097561 in words is "one hundred fifty-six million, ninety-seven thousand, five hundred sixty-one".