30997173 has 4 divisors (see below), whose sum is σ = 41329568. Its totient is φ = 20664780.

The previous prime is 30997159. The next prime is 30997177. The reversal of 30997173 is 37179903.

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 not a de Polignac number, because 30997173 - 2¹² = 30993077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30997177) 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, 5166193 + ... + 5166198.

It is an arithmetic number, because the mean of its divisors is an integer number (10332392).

Almost surely, 2^30997173 is an apocalyptic number.

It is an amenable number.

30997173 is a deficient number, since it is larger than the sum of its proper divisors (10332395).

30997173 is a wasteful number, since it uses less digits than its factorization.

30997173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10332394.

The product of its (nonzero) digits is 35721, while the sum is 39.

The square root of 30997173 is about 5567.5104849475. The cubic root of 30997173 is about 314.1285158272.

The spelling of 30997173 in words is "thirty million, nine hundred ninety-seven thousand, one hundred seventy-three".