139195031 has 4 divisors (see below), whose sum is σ = 147382992. Its totient is φ = 131007072.

The previous prime is 139195027. The next prime is 139195033. The reversal of 139195031 is 130591931.

It is a happy number.

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 139195031 - 2² = 139195027 is a prime.

It is a super-2 number, since 2×139195031² = 38750513310181922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139195033) 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, 4093955 + ... + 4093988.

It is an arithmetic number, because the mean of its divisors is an integer number (36845748).

Almost surely, 2^139195031 is an apocalyptic number.

139195031 is a deficient number, since it is larger than the sum of its proper divisors (8187961).

139195031 is an equidigital number, since it uses as much as digits as its factorization.

139195031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8187960.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 139195031 is about 11798.0943800260. The cubic root of 139195031 is about 518.2523069848.

The spelling of 139195031 in words is "one hundred thirty-nine million, one hundred ninety-five thousand, thirty-one".