99970993 has 2 divisors, whose sum is σ = 99970994. Its totient is φ = 99970992.

The previous prime is 99970979. The next prime is 99971017. The reversal of 99970993 is 39907999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93064609 + 6906384 = 9647^2 + 2628^2 .

It is a cyclic number.

It is not a de Polignac number, because 99970993 - 2⁵ = 99970961 is a prime.

It is not a weakly prime, because it can be changed into another prime (99970933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49985496 + 49985497.

It is an arithmetic number, because the mean of its divisors is an integer number (49985497).

Almost surely, 2^99970993 is an apocalyptic number.

It is an amenable number.

99970993 is a deficient number, since it is larger than the sum of its proper divisors (1).

99970993 is an equidigital number, since it uses as much as digits as its factorization.

99970993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 99970993 is about 9998.5495448090. The cubic root of 99970993 is about 464.1139994987.

The spelling of 99970993 in words is "ninety-nine million, nine hundred seventy thousand, nine hundred ninety-three".