31664597 has 2 divisors, whose sum is σ = 31664598. Its totient is φ = 31664596.

The previous prime is 31664579. The next prime is 31664599. The reversal of 31664597 is 79546613.

Together with previous prime (31664579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29149201 + 2515396 = 5399^2 + 1586^2 .

It is an emirp because it is prime and its reverse (79546613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31664597 - 2¹⁰ = 31663573 is a prime.

Together with 31664599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31664599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15832298 + 15832299.

It is an arithmetic number, because the mean of its divisors is an integer number (15832299).

Almost surely, 2^31664597 is an apocalyptic number.

It is an amenable number.

31664597 is a deficient number, since it is larger than the sum of its proper divisors (1).

31664597 is an equidigital number, since it uses as much as digits as its factorization.

31664597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 31664597 is about 5627.1304409974. The cubic root of 31664597 is about 316.3671059380.

The spelling of 31664597 in words is "thirty-one million, six hundred sixty-four thousand, five hundred ninety-seven".