77491161 has 40 divisors (see below), whose sum is σ = 130680000. Its totient is φ = 45329760.

The previous prime is 77491159. The next prime is 77491171. The reversal of 77491161 is 16119477.

77491161 is a `hidden beast` number, since 7 + 7 + 491 + 161 = 666.

It is not a de Polignac number, because 77491161 - 2¹ = 77491159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77491111) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24340 + ... + 27338.

It is an arithmetic number, because the mean of its divisors is an integer number (3267000).

Almost surely, 2^77491161 is an apocalyptic number.

It is an amenable number.

77491161 is a deficient number, since it is larger than the sum of its proper divisors (53188839).

77491161 is a wasteful number, since it uses less digits than its factorization.

77491161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051 (or 3042 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 77491161 is about 8802.9063950493. The cubic root of 77491161 is about 426.3347398767.

The spelling of 77491161 in words is "seventy-seven million, four hundred ninety-one thousand, one hundred sixty-one".