30521397 has 4 divisors (see below), whose sum is σ = 40695200. Its totient is φ = 20347596.

The previous prime is 30521389. The next prime is 30521459. The reversal of 30521397 is 79312503.

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: 79312503 = 3 ⋅26437501.

It is not a de Polignac number, because 30521397 - 2³ = 30521389 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 (30521317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5086897 + ... + 5086902.

It is an arithmetic number, because the mean of its divisors is an integer number (10173800).

Almost surely, 2^30521397 is an apocalyptic number.

It is an amenable number.

30521397 is a deficient number, since it is larger than the sum of its proper divisors (10173803).

30521397 is a wasteful number, since it uses less digits than its factorization.

30521397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10173802.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 30521397 is about 5524.6173623157. The cubic root of 30521397 is about 312.5130345496.

The spelling of 30521397 in words is "thirty million, five hundred twenty-one thousand, three hundred ninety-seven".