87777131 has 16 divisors (see below), whose sum is σ = 103837440. Its totient is φ = 73418400.

The previous prime is 87777127. The next prime is 87777139. The reversal of 87777131 is 13177778.

It is a cyclic number.

It is not a de Polignac number, because 87777131 - 2² = 87777127 is a prime.

It is a super-2 number, since 2×87777131² = 15409649453182322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87777139) 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, 2045 + ... + 13406.

It is an arithmetic number, because the mean of its divisors is an integer number (6489840).

Almost surely, 2^87777131 is an apocalyptic number.

87777131 is a deficient number, since it is larger than the sum of its proper divisors (16060309).

87777131 is a wasteful number, since it uses less digits than its factorization.

87777131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15506.

The product of its digits is 57624, while the sum is 41.

The square root of 87777131 is about 9368.9450313256. The cubic root of 87777131 is about 444.4202035367.

The spelling of 87777131 in words is "eighty-seven million, seven hundred seventy-seven thousand, one hundred thirty-one".