31394621 has 4 divisors (see below), whose sum is σ = 31434144. Its totient is φ = 31355100.

The previous prime is 31394591. The next prime is 31394633. The reversal of 31394621 is 12649313.

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 31394621 - 2¹⁸ = 31132477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31394651) 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, 18545 + ... + 20166.

It is an arithmetic number, because the mean of its divisors is an integer number (7858536).

Almost surely, 2^31394621 is an apocalyptic number.

It is an amenable number.

31394621 is a deficient number, since it is larger than the sum of its proper divisors (39523).

31394621 is an equidigital number, since it uses as much as digits as its factorization.

31394621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39522.

The product of its digits is 3888, while the sum is 29.

The square root of 31394621 is about 5603.0903080354. The cubic root of 31394621 is about 315.4654109523.

The spelling of 31394621 in words is "thirty-one million, three hundred ninety-four thousand, six hundred twenty-one".