61161291 has 32 divisors (see below), whose sum is σ = 96526080. Its totient is φ = 38141568.

The previous prime is 61161281. The next prime is 61161329. The reversal of 61161291 is 19216116.

It is not a de Polignac number, because 61161291 - 2⁶ = 61161227 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 (61161271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103900 + ... + 104486.

It is an arithmetic number, because the mean of its divisors is an integer number (3016440).

Almost surely, 2^61161291 is an apocalyptic number.

61161291 is a deficient number, since it is larger than the sum of its proper divisors (35364789).

61161291 is a wasteful number, since it uses less digits than its factorization.

61161291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 834 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 61161291 is about 7820.5684575995. The cubic root of 61161291 is about 393.9963646413.

The spelling of 61161291 in words is "sixty-one million, one hundred sixty-one thousand, two hundred ninety-one".