31795139 has 4 divisors (see below), whose sum is σ = 31820880. Its totient is φ = 31769400.

The previous prime is 31795123. The next prime is 31795147. The reversal of 31795139 is 93159713.

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 31795139 - 2⁴ = 31795123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31795109) 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, 10919 + ... + 13520.

It is an arithmetic number, because the mean of its divisors is an integer number (7955220).

Almost surely, 2^31795139 is an apocalyptic number.

31795139 is a deficient number, since it is larger than the sum of its proper divisors (25741).

31795139 is a wasteful number, since it uses less digits than its factorization.

31795139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25740.

The product of its digits is 25515, while the sum is 38.

The square root of 31795139 is about 5638.7178507175. The cubic root of 31795139 is about 316.8012666333.

The spelling of 31795139 in words is "thirty-one million, seven hundred ninety-five thousand, one hundred thirty-nine".