99651381 has 4 divisors (see below), whose sum is σ = 132868512. Its totient is φ = 66434252.

The previous prime is 99651379. The next prime is 99651403. The reversal of 99651381 is 18315699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99651381 - 2¹ = 99651379 is a prime.

It is a super-2 number, since 2×99651381² = 19860795470414322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99651481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16608561 + ... + 16608566.

It is an arithmetic number, because the mean of its divisors is an integer number (33217128).

Almost surely, 2^99651381 is an apocalyptic number.

It is an amenable number.

99651381 is a deficient number, since it is larger than the sum of its proper divisors (33217131).

99651381 is a wasteful number, since it uses less digits than its factorization.

99651381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33217130.

The product of its digits is 58320, while the sum is 42.

The square root of 99651381 is about 9982.5538315603. The cubic root of 99651381 is about 463.6188733292.

The spelling of 99651381 in words is "ninety-nine million, six hundred fifty-one thousand, three hundred eighty-one".