99720497 has 2 divisors, whose sum is σ = 99720498. Its totient is φ = 99720496.

The previous prime is 99720463. The next prime is 99720529. The reversal of 99720497 is 79402799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 15649936 = 9169^2 + 3956^2 .

It is a cyclic number.

It is not a de Polignac number, because 99720497 - 2¹⁴ = 99704113 is a prime.

It is not a weakly prime, because it can be changed into another prime (99720197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49860248 + 49860249.

It is an arithmetic number, because the mean of its divisors is an integer number (49860249).

Almost surely, 2^99720497 is an apocalyptic number.

It is an amenable number.

99720497 is a deficient number, since it is larger than the sum of its proper divisors (1).

99720497 is an equidigital number, since it uses as much as digits as its factorization.

99720497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 99720497 is about 9986.0150710882. The cubic root of 99720497 is about 463.7260338334.

The spelling of 99720497 in words is "ninety-nine million, seven hundred twenty thousand, four hundred ninety-seven".