31331401 has 4 divisors (see below), whose sum is σ = 31570704. Its totient is φ = 31092100.

The previous prime is 31331393. The next prime is 31331407. The reversal of 31331401 is 10413313.

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.

It is a cyclic number.

It is not a de Polignac number, because 31331401 - 2³ = 31331393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31331407) 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, 119455 + ... + 119716.

It is an arithmetic number, because the mean of its divisors is an integer number (7892676).

Almost surely, 2^31331401 is an apocalyptic number.

It is an amenable number.

31331401 is a deficient number, since it is larger than the sum of its proper divisors (239303).

31331401 is a wasteful number, since it uses less digits than its factorization.

31331401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239302.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 31331401 is about 5597.4459354245. The cubic root of 31331401 is about 315.2535155738.

Adding to 31331401 its reverse (10413313), we get a palindrome (41744714).

The spelling of 31331401 in words is "thirty-one million, three hundred thirty-one thousand, four hundred one".