139788131 has 6 divisors (see below), whose sum is σ = 162610740. Its totient is φ = 119818356.

The previous prime is 139788101. The next prime is 139788139. The reversal of 139788131 is 131887931.

It is not a de Polignac number, because 139788131 - 2²² = 135593827 is a prime.

It is a super-2 number, since 2×139788131² = 39081443136946322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139788139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1426361 + ... + 1426458.

It is an arithmetic number, because the mean of its divisors is an integer number (27101790).

Almost surely, 2^139788131 is an apocalyptic number.

139788131 is a deficient number, since it is larger than the sum of its proper divisors (22822609).

139788131 is an equidigital number, since it uses as much as digits as its factorization.

139788131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852833 (or 2852826 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 139788131 is about 11823.2030770007. The cubic root of 139788131 is about 518.9873425756.

The spelling of 139788131 in words is "one hundred thirty-nine million, seven hundred eighty-eight thousand, one hundred thirty-one".