30997217 has 4 divisors (see below), whose sum is σ = 31039680. Its totient is φ = 30954756.

The previous prime is 30997193. The next prime is 30997237. The reversal of 30997217 is 71279903.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71279903 = 61 ⋅1168523.

It is a cyclic number.

It is not a de Polignac number, because 30997217 - 2¹⁸ = 30735073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30997237) 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, 20117 + ... + 21602.

It is an arithmetic number, because the mean of its divisors is an integer number (7759920).

Almost surely, 2^30997217 is an apocalyptic number.

It is an amenable number.

30997217 is a deficient number, since it is larger than the sum of its proper divisors (42463).

30997217 is an equidigital number, since it uses as much as digits as its factorization.

30997217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42462.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 30997217 is about 5567.5144364429. The cubic root of 30997217 is about 314.1286644607.

The spelling of 30997217 in words is "thirty million, nine hundred ninety-seven thousand, two hundred seventeen".