30813661 has 4 divisors (see below), whose sum is σ = 30949632. Its totient is φ = 30677692.

The previous prime is 30813641. The next prime is 30813697. The reversal of 30813661 is 16631803.

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 a cyclic number.

It is not a de Polignac number, because 30813661 - 2⁷ = 30813533 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 (30813641) 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, 67645 + ... + 68098.

It is an arithmetic number, because the mean of its divisors is an integer number (7737408).

Almost surely, 2^30813661 is an apocalyptic number.

It is an amenable number.

30813661 is a deficient number, since it is larger than the sum of its proper divisors (135971).

30813661 is a wasteful number, since it uses less digits than its factorization.

30813661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135970.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 30813661 is about 5551.0054044290. The cubic root of 30813661 is about 313.5073786596.

The spelling of 30813661 in words is "thirty million, eight hundred thirteen thousand, six hundred sixty-one".