27777120131 has 4 divisors (see below), whose sum is σ = 29411068392. Its totient is φ = 26143171872.

The previous prime is 27777120127. The next prime is 27777120139. The reversal of 27777120131 is 13102177772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27777120131 - 2² = 27777120127 is a prime.

It is a super-2 number, since 2×27777120131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27777120139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816974105 + ... + 816974138.

It is an arithmetic number, because the mean of its divisors is an integer number (7352767098).

Almost surely, 2^27777120131 is an apocalyptic number.

27777120131 is a deficient number, since it is larger than the sum of its proper divisors (1633948261).

27777120131 is a wasteful number, since it uses less digits than its factorization.

27777120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633948260.

The product of its (nonzero) digits is 28812, while the sum is 38.

The spelling of 27777120131 in words is "twenty-seven billion, seven hundred seventy-seven million, one hundred twenty thousand, one hundred thirty-one".