99581671 has 12 divisors (see below), whose sum is σ = 116119488. Its totient is φ = 85149792.

The previous prime is 99581663. The next prime is 99581693. The reversal of 99581671 is 17618599.

It is a happy number.

It is not a de Polignac number, because 99581671 - 2³ = 99581663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99581611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20170 + ... + 24616.

It is an arithmetic number, because the mean of its divisors is an integer number (9676624).

Almost surely, 2^99581671 is an apocalyptic number.

99581671 is a deficient number, since it is larger than the sum of its proper divisors (16537817).

99581671 is a wasteful number, since it uses less digits than its factorization.

99581671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4918 (or 4911 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The square root of 99581671 is about 9979.0616292315. The cubic root of 99581671 is about 463.5107416594.

The spelling of 99581671 in words is "ninety-nine million, five hundred eighty-one thousand, six hundred seventy-one".