31713421 has 4 divisors (see below), whose sum is σ = 31751200. Its totient is φ = 31675644.

The previous prime is 31713401. The next prime is 31713433. The reversal of 31713421 is 12431713.

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 31713421 - 2¹¹ = 31711373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31713392 and 31713401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31713401) 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, 17601 + ... + 19318.

It is an arithmetic number, because the mean of its divisors is an integer number (7937800).

Almost surely, 2^31713421 is an apocalyptic number.

It is an amenable number.

31713421 is a deficient number, since it is larger than the sum of its proper divisors (37779).

31713421 is an equidigital number, since it uses as much as digits as its factorization.

31713421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37778.

The product of its digits is 504, while the sum is 22.

The square root of 31713421 is about 5631.4670379929. The cubic root of 31713421 is about 316.5296257750.

The spelling of 31713421 in words is "thirty-one million, seven hundred thirteen thousand, four hundred twenty-one".