30512961 has 6 divisors (see below), whose sum is σ = 44074290. Its totient is φ = 20341968.

The previous prime is 30512957. The next prime is 30512969. The reversal of 30512961 is 16921503.

It can be written as a sum of positive squares in only one way, i.e., 30305025 + 207936 = 5505^2 + 456^2 .

It is not a de Polignac number, because 30512961 - 2² = 30512957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30512969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1695156 + ... + 1695173.

It is an arithmetic number, because the mean of its divisors is an integer number (7345715).

Almost surely, 2^30512961 is an apocalyptic number.

It is an amenable number.

30512961 is a deficient number, since it is larger than the sum of its proper divisors (13561329).

30512961 is a wasteful number, since it uses less digits than its factorization.

30512961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390335 (or 3390332 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 30512961 is about 5523.8538177617. The cubic root of 30512961 is about 312.4842394185.

The spelling of 30512961 in words is "thirty million, five hundred twelve thousand, nine hundred sixty-one".