30893957 has 2 divisors, whose sum is σ = 30893958. Its totient is φ = 30893956.

The previous prime is 30893953. The next prime is 30893959. The reversal of 30893957 is 75939803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 12967201 = 4234^2 + 3601^2 .

It is an emirp because it is prime and its reverse (75939803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30893957 - 2² = 30893953 is a prime.

Together with 30893959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30893953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15446978 + 15446979.

It is an arithmetic number, because the mean of its divisors is an integer number (15446979).

Almost surely, 2^30893957 is an apocalyptic number.

It is an amenable number.

30893957 is a deficient number, since it is larger than the sum of its proper divisors (1).

30893957 is an equidigital number, since it uses as much as digits as its factorization.

30893957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 30893957 is about 5558.2332624675. The cubic root of 30893957 is about 313.7794609458.

The spelling of 30893957 in words is "thirty million, eight hundred ninety-three thousand, nine hundred fifty-seven".