30561997 has 4 divisors (see below), whose sum is σ = 30573280. Its totient is φ = 30550716.

The previous prime is 30561991. The next prime is 30562003. The reversal of 30561997 is 79916503.

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 a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (30561991) and next prime (30562003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30561997 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 (30561991) 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, 1138 + ... + 7900.

It is an arithmetic number, because the mean of its divisors is an integer number (7643320).

Almost surely, 2^30561997 is an apocalyptic number.

It is an amenable number.

30561997 is a deficient number, since it is larger than the sum of its proper divisors (11283).

30561997 is an equidigital number, since it uses as much as digits as its factorization.

30561997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 30561997 is about 5528.2906037943. The cubic root of 30561997 is about 312.6515429260.

The spelling of 30561997 in words is "thirty million, five hundred sixty-one thousand, nine hundred ninety-seven".