30999999997 has 2 divisors, whose sum is σ = 30999999998. Its totient is φ = 30999999996.

The previous prime is 30999999973. The next prime is 31000000027. The reversal of 30999999997 is 79999999903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17575070041 + 13424929956 = 132571^2 + 115866^2 .

It is an emirp because it is prime and its reverse (79999999903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30999999997 - 2⁷ = 30999999869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30999999997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30999999967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15499999998 + 15499999999.

It is an arithmetic number, because the mean of its divisors is an integer number (15499999999).

Almost surely, 2^30999999997 is an apocalyptic number.

It is an amenable number.

30999999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

30999999997 is an equidigital number, since it uses as much as digits as its factorization.

30999999997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903981141, while the sum is 82.

The spelling of 30999999997 in words is "thirty billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".