30512861 has 2 divisors, whose sum is σ = 30512862. Its totient is φ = 30512860.

The previous prime is 30512857. The next prime is 30512873. The reversal of 30512861 is 16821503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17480761 + 13032100 = 4181^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 30512861 - 2² = 30512857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30512861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30512821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15256430 + 15256431.

It is an arithmetic number, because the mean of its divisors is an integer number (15256431).

Almost surely, 2^30512861 is an apocalyptic number.

It is an amenable number.

30512861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30512861 is an equidigital number, since it uses as much as digits as its factorization.

30512861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 30512861 is about 5523.8447661027. The cubic root of 30512861 is about 312.4838980503.

The spelling of 30512861 in words is "thirty million, five hundred twelve thousand, eight hundred sixty-one".