30999644057 has 2 divisors, whose sum is σ = 30999644058. Its totient is φ = 30999644056.

The previous prime is 30999643907. The next prime is 30999644063. The reversal of 30999644057 is 75044699903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26496026176 + 4503617881 = 162776^2 + 67109^2 .

It is a cyclic number.

It is not a de Polignac number, because 30999644057 - 2¹⁸ = 30999381913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30999643993 and 30999644011.

It is not a weakly prime, because it can be changed into another prime (30999644087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15499822028 + 15499822029.

It is an arithmetic number, because the mean of its divisors is an integer number (15499822029).

Almost surely, 2^30999644057 is an apocalyptic number.

It is an amenable number.

30999644057 is a deficient number, since it is larger than the sum of its proper divisors (1).

30999644057 is an equidigital number, since it uses as much as digits as its factorization.

30999644057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 56.

The spelling of 30999644057 in words is "thirty billion, nine hundred ninety-nine million, six hundred forty-four thousand, fifty-seven".