99400591 has 4 divisors (see below), whose sum is σ = 99420552. Its totient is φ = 99380632.

The previous prime is 99400589. The next prime is 99400607. The reversal of 99400591 is 19500499.

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 99400591 - 2¹ = 99400589 is a prime.

It is a super-2 number, since 2×99400591² = 19760954982298562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99400591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99400501) 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, 4320 + ... + 14746.

It is an arithmetic number, because the mean of its divisors is an integer number (24855138).

Almost surely, 2^99400591 is an apocalyptic number.

99400591 is a deficient number, since it is larger than the sum of its proper divisors (19961).

99400591 is a wasteful number, since it uses less digits than its factorization.

99400591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19960.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 99400591 is about 9969.9845034985. The cubic root of 99400591 is about 463.2296208125.

The spelling of 99400591 in words is "ninety-nine million, four hundred thousand, five hundred ninety-one".