99977749 has 2 divisors, whose sum is σ = 99977750. Its totient is φ = 99977748.

The previous prime is 99977729. The next prime is 99977771. The reversal of 99977749 is 94777999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94770225 + 5207524 = 9735^2 + 2282^2 .

It is a cyclic number.

It is not a de Polignac number, because 99977749 - 2⁷ = 99977621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99977729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988874 + 49988875.

It is an arithmetic number, because the mean of its divisors is an integer number (49988875).

Almost surely, 2^99977749 is an apocalyptic number.

It is an amenable number.

99977749 is a deficient number, since it is larger than the sum of its proper divisors (1).

99977749 is an equidigital number, since it uses as much as digits as its factorization.

99977749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9001692, while the sum is 61.

The square root of 99977749 is about 9998.8873881047. The cubic root of 99977749 is about 464.1244541432.

The spelling of 99977749 in words is "ninety-nine million, nine hundred seventy-seven thousand, seven hundred forty-nine".