99653971 has 4 divisors (see below), whose sum is σ = 99674344. Its totient is φ = 99633600.

The previous prime is 99653929. The next prime is 99654001. The reversal of 99653971 is 17935699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99653971 - 2⁷ = 99653843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99653921) 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, 2056 + ... + 14266.

It is an arithmetic number, because the mean of its divisors is an integer number (24918586).

Almost surely, 2^99653971 is an apocalyptic number.

99653971 is a deficient number, since it is larger than the sum of its proper divisors (20373).

99653971 is a wasteful number, since it uses less digits than its factorization.

99653971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20372.

The product of its digits is 459270, while the sum is 49.

The square root of 99653971 is about 9982.6835570402. The cubic root of 99653971 is about 463.6228898733.

The spelling of 99653971 in words is "ninety-nine million, six hundred fifty-three thousand, nine hundred seventy-one".