30928121 has 4 divisors (see below), whose sum is σ = 35346432. Its totient is φ = 26509812.

The previous prime is 30928103. The next prime is 30928127. The reversal of 30928121 is 12182903.

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 30928121 - 2¹⁴ = 30911737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30928127) 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, 2209145 + ... + 2209158.

It is an arithmetic number, because the mean of its divisors is an integer number (8836608).

Almost surely, 2^30928121 is an apocalyptic number.

It is an amenable number.

30928121 is a deficient number, since it is larger than the sum of its proper divisors (4418311).

30928121 is an equidigital number, since it uses as much as digits as its factorization.

30928121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4418310.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 30928121 is about 5561.3056920115. The cubic root of 30928121 is about 313.8950823965.

The spelling of 30928121 in words is "thirty million, nine hundred twenty-eight thousand, one hundred twenty-one".