99551571 has 32 divisors (see below), whose sum is σ = 160862208. Its totient is φ = 53550720.

The previous prime is 99551561. The next prime is 99551581. The reversal of 99551571 is 17515599.

It is an interprime number because it is at equal distance from previous prime (99551561) and next prime (99551581).

It is not a de Polignac number, because 99551571 - 2¹¹ = 99549523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99551561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22021 + ... + 26153.

It is an arithmetic number, because the mean of its divisors is an integer number (5026944).

Almost surely, 2^99551571 is an apocalyptic number.

99551571 is a deficient number, since it is larger than the sum of its proper divisors (61310637).

99551571 is a wasteful number, since it uses less digits than its factorization.

99551571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its digits is 70875, while the sum is 42.

The square root of 99551571 is about 9977.5533574118. The cubic root of 99551571 is about 463.4640360119.

The spelling of 99551571 in words is "ninety-nine million, five hundred fifty-one thousand, five hundred seventy-one".