30997621 has 8 divisors (see below), whose sum is σ = 31351320. Its totient is φ = 30646272.

The previous prime is 30997573. The next prime is 30997627. The reversal of 30997621 is 12679903.

It can be written as a sum of positive squares in 4 ways, for example, as 5130225 + 25867396 = 2265^2 + 5086^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30997621 - 2¹⁵ = 30964853 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 (30997627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39925 + ... + 40693.

It is an arithmetic number, because the mean of its divisors is an integer number (3918915).

Almost surely, 2^30997621 is an apocalyptic number.

It is an amenable number.

30997621 is a deficient number, since it is larger than the sum of its proper divisors (353699).

30997621 is a wasteful number, since it uses less digits than its factorization.

30997621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 30997621 is about 5567.5507182243. The cubic root of 30997621 is about 314.1300291792.

The spelling of 30997621 in words is "thirty million, nine hundred ninety-seven thousand, six hundred twenty-one".