99621801 has 6 divisors (see below), whose sum is σ = 143898170. Its totient is φ = 66414528.

The previous prime is 99621793. The next prime is 99621803. The reversal of 99621801 is 10812699.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 19053225 = 8976^2 + 4365^2 .

It is not a de Polignac number, because 99621801 - 2³ = 99621793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99621803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5534536 + ... + 5534553.

Almost surely, 2^99621801 is an apocalyptic number.

It is an amenable number.

99621801 is a deficient number, since it is larger than the sum of its proper divisors (44276369).

99621801 is a wasteful number, since it uses less digits than its factorization.

99621801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11069095 (or 11069092 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 99621801 is about 9981.0721367997. The cubic root of 99621801 is about 463.5729960476.

The spelling of 99621801 in words is "ninety-nine million, six hundred twenty-one thousand, eight hundred one".