99979993 has 2 divisors, whose sum is σ = 99979994. Its totient is φ = 99979992.

The previous prime is 99979981. The next prime is 99980003. The reversal of 99979993 is 39997999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79067664 + 20912329 = 8892^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 99979993 - 2⁵ = 99979961 is a prime.

It is not a weakly prime, because it can be changed into another prime (99979903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49989996 + 49989997.

It is an arithmetic number, because the mean of its divisors is an integer number (49989997).

Almost surely, 2^99979993 is an apocalyptic number.

It is an amenable number.

99979993 is a deficient number, since it is larger than the sum of its proper divisors (1).

99979993 is an equidigital number, since it uses as much as digits as its factorization.

99979993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11160261, while the sum is 64.

The square root of 99979993 is about 9998.9995999600. Note that the first 3 decimals coincide. The cubic root of 99979993 is about 464.1279265407.

The spelling of 99979993 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred ninety-three".