77761131 has 8 divisors (see below), whose sum is σ = 118493184. Its totient is φ = 44434920.

The previous prime is 77761121. The next prime is 77761139. The reversal of 77761131 is 13116777.

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

It is not a de Polignac number, because 77761131 - 2⁶ = 77761067 is a prime.

It is a super-2 number, since 2×77761131² = 12093586988798322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 77761092 and 77761101.

It is not an unprimeable number, because it can be changed into a prime (77761139) 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, 1851435 + ... + 1851476.

It is an arithmetic number, because the mean of its divisors is an integer number (14811648).

Almost surely, 2^77761131 is an apocalyptic number.

77761131 is a deficient number, since it is larger than the sum of its proper divisors (40732053).

77761131 is a wasteful number, since it uses less digits than its factorization.

77761131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702921.

The product of its digits is 6174, while the sum is 33.

The square root of 77761131 is about 8818.2272027886. The cubic root of 77761131 is about 426.8292658942.

The spelling of 77761131 in words is "seventy-seven million, seven hundred sixty-one thousand, one hundred thirty-one".