131139977 has 4 divisors (see below), whose sum is σ = 131165076. Its totient is φ = 131114880.

The previous prime is 131139973. The next prime is 131139991. The reversal of 131139977 is 779931131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 72403081 + 58736896 = 8509^2 + 7664^2 .

It is a cyclic number.

It is not a de Polignac number, because 131139977 - 2² = 131139973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131139973) 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, 1424 + ... + 16257.

It is an arithmetic number, because the mean of its divisors is an integer number (32791269).

Almost surely, 2^131139977 is an apocalyptic number.

It is an amenable number.

131139977 is a deficient number, since it is larger than the sum of its proper divisors (25099).

131139977 is an equidigital number, since it uses as much as digits as its factorization.

131139977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25098.

The product of its digits is 35721, while the sum is 41.

The square root of 131139977 is about 11451.6364332789. The cubic root of 131139977 is about 508.0561362004.

The spelling of 131139977 in words is "one hundred thirty-one million, one hundred thirty-nine thousand, nine hundred seventy-seven".