99722639 has 2 divisors, whose sum is σ = 99722640. Its totient is φ = 99722638.

The previous prime is 99722611. The next prime is 99722647. The reversal of 99722639 is 93622799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99722639 - 2²⁰ = 98674063 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99722593 and 99722602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99722339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49861319 + 49861320.

It is an arithmetic number, because the mean of its divisors is an integer number (49861320).

Almost surely, 2^99722639 is an apocalyptic number.

99722639 is a deficient number, since it is larger than the sum of its proper divisors (1).

99722639 is an equidigital number, since it uses as much as digits as its factorization.

99722639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 99722639 is about 9986.1223205006. The cubic root of 99722639 is about 463.7293540938.

The spelling of 99722639 in words is "ninety-nine million, seven hundred twenty-two thousand, six hundred thirty-nine".