31139401 has 4 divisors (see below), whose sum is σ = 32493312. Its totient is φ = 29785492.

The previous prime is 31139399. The next prime is 31139413. The reversal of 31139401 is 10493113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10493113 = 181 ⋅57973.

It is a cyclic number.

It is not a de Polignac number, because 31139401 - 2¹ = 31139399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31139441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676921 + ... + 676966.

It is an arithmetic number, because the mean of its divisors is an integer number (8123328).

Almost surely, 2^31139401 is an apocalyptic number.

It is an amenable number.

31139401 is a deficient number, since it is larger than the sum of its proper divisors (1353911).

31139401 is a wasteful number, since it uses less digits than its factorization.

31139401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353910.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31139401 is about 5580.2689003309. The cubic root of 31139401 is about 314.6082338822.

The spelling of 31139401 in words is "thirty-one million, one hundred thirty-nine thousand, four hundred one".