99616591 has 4 divisors (see below), whose sum is σ = 99781312. Its totient is φ = 99451872.

The previous prime is 99616589. The next prime is 99616613. The reversal of 99616591 is 19561699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19561699 = 97 ⋅201667.

It is a cyclic number.

It is not a de Polignac number, because 99616591 - 2¹ = 99616589 is a prime.

It is a super-2 number, since 2×99616591² = 19846930404922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99616571) 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, 81450 + ... + 82663.

It is an arithmetic number, because the mean of its divisors is an integer number (24945328).

Almost surely, 2^99616591 is an apocalyptic number.

99616591 is a deficient number, since it is larger than the sum of its proper divisors (164721).

99616591 is a wasteful number, since it uses less digits than its factorization.

99616591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164720.

The product of its digits is 131220, while the sum is 46.

The square root of 99616591 is about 9980.8111393814. The cubic root of 99616591 is about 463.5649146257.

The spelling of 99616591 in words is "ninety-nine million, six hundred sixteen thousand, five hundred ninety-one".