31664471 has 2 divisors, whose sum is σ = 31664472. Its totient is φ = 31664470.

The previous prime is 31664461. The next prime is 31664483. The reversal of 31664471 is 17446613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31664471 - 2¹⁴ = 31648087 is a prime.

It is a super-3 number, since 3×31664471³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31664461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832235 + 15832236.

It is an arithmetic number, because the mean of its divisors is an integer number (15832236).

Almost surely, 2^31664471 is an apocalyptic number.

31664471 is a deficient number, since it is larger than the sum of its proper divisors (1).

31664471 is an equidigital number, since it uses as much as digits as its factorization.

31664471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 31664471 is about 5627.1192452266. The cubic root of 31664471 is about 316.3666863073.

The spelling of 31664471 in words is "thirty-one million, six hundred sixty-four thousand, four hundred seventy-one".