61156161 has 16 divisors (see below), whose sum is σ = 98838720. Its totient is φ = 37064160.

The previous prime is 61156129. The next prime is 61156163. The reversal of 61156161 is 16165116.

It is not a de Polignac number, because 61156161 - 2⁵ = 61156129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61156163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102660 + ... + 103253.

It is an arithmetic number, because the mean of its divisors is an integer number (6177420).

Almost surely, 2^61156161 is an apocalyptic number.

It is an amenable number.

61156161 is a deficient number, since it is larger than the sum of its proper divisors (37682559).

61156161 is a wasteful number, since it uses less digits than its factorization.

61156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205933 (or 205927 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 61156161 is about 7820.2404694485. The cubic root of 61156161 is about 393.9853486439.

The spelling of 61156161 in words is "sixty-one million, one hundred fifty-six thousand, one hundred sixty-one".