99651901 has 2 divisors, whose sum is σ = 99651902. Its totient is φ = 99651900.

The previous prime is 99651899. The next prime is 99651907. The reversal of 99651901 is 10915699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 251001 = 9970^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 99651901 - 2¹ = 99651899 is a prime.

Together with 99651899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99651907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49825950 + 49825951.

It is an arithmetic number, because the mean of its divisors is an integer number (49825951).

Almost surely, 2^99651901 is an apocalyptic number.

It is an amenable number.

99651901 is a deficient number, since it is larger than the sum of its proper divisors (1).

99651901 is an equidigital number, since it uses as much as digits as its factorization.

99651901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 99651901 is about 9982.5798769657. The cubic root of 99651901 is about 463.6196797452.

The spelling of 99651901 in words is "ninety-nine million, six hundred fifty-one thousand, nine hundred one".