31664419 has 2 divisors, whose sum is σ = 31664420. Its totient is φ = 31664418.

The previous prime is 31664377. The next prime is 31664443. The reversal of 31664419 is 91446613.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31664419 is a prime.

It is a super-2 number, since 2×31664419² = 2005270861215122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31664459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832209 + 15832210.

It is an arithmetic number, because the mean of its divisors is an integer number (15832210).

Almost surely, 2^31664419 is an apocalyptic number.

31664419 is a deficient number, since it is larger than the sum of its proper divisors (1).

31664419 is an equidigital number, since it uses as much as digits as its factorization.

31664419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 31664419 is about 5627.1146247433. The cubic root of 31664419 is about 316.3665131261.

The spelling of 31664419 in words is "thirty-one million, six hundred sixty-four thousand, four hundred nineteen".