30972621 has 4 divisors (see below), whose sum is σ = 41296832. Its totient is φ = 20648412.

The previous prime is 30972611. The next prime is 30972629. The reversal of 30972621 is 12627903.

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 30972621 - 2¹⁷ = 30841549 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 (30972629) 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, 5162101 + ... + 5162106.

It is an arithmetic number, because the mean of its divisors is an integer number (10324208).

Almost surely, 2^30972621 is an apocalyptic number.

It is an amenable number.

30972621 is a deficient number, since it is larger than the sum of its proper divisors (10324211).

30972621 is a wasteful number, since it uses less digits than its factorization.

30972621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324210.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 30972621 is about 5565.3051129296. The cubic root of 30972621 is about 314.0455564286.

The spelling of 30972621 in words is "thirty million, nine hundred seventy-two thousand, six hundred twenty-one".