99967993 has 2 divisors, whose sum is σ = 99967994. Its totient is φ = 99967992.

The previous prime is 99967981. The next prime is 99967997. The reversal of 99967993 is 39976999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95004009 + 4963984 = 9747^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 99967993 - 2⁵ = 99967961 is a prime.

It is not a weakly prime, because it can be changed into another prime (99967997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49983996 + 49983997.

It is an arithmetic number, because the mean of its divisors is an integer number (49983997).

Almost surely, 2^99967993 is an apocalyptic number.

It is an amenable number.

99967993 is a deficient number, since it is larger than the sum of its proper divisors (1).

99967993 is an equidigital number, since it uses as much as digits as its factorization.

99967993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7440174, while the sum is 61.

The square root of 99967993 is about 9998.3995219235. The cubic root of 99967993 is about 464.1093569657.

The spelling of 99967993 in words is "ninety-nine million, nine hundred sixty-seven thousand, nine hundred ninety-three".