99977729 has 2 divisors, whose sum is σ = 99977730. Its totient is φ = 99977728.

The previous prime is 99977707. The next prime is 99977749. The reversal of 99977729 is 92777999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89737729 + 10240000 = 9473^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 99977729 - 2⁸ = 99977473 is a prime.

It is not a weakly prime, because it can be changed into another prime (99977749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988864 + 49988865.

It is an arithmetic number, because the mean of its divisors is an integer number (49988865).

Almost surely, 2^99977729 is an apocalyptic number.

It is an amenable number.

99977729 is a deficient number, since it is larger than the sum of its proper divisors (1).

99977729 is an equidigital number, since it uses as much as digits as its factorization.

99977729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500846, while the sum is 59.

The square root of 99977729 is about 9998.8863879934. The cubic root of 99977729 is about 464.1244231946.

The spelling of 99977729 in words is "ninety-nine million, nine hundred seventy-seven thousand, seven hundred twenty-nine".