99790591 has 4 divisors (see below), whose sum is σ = 102487672. Its totient is φ = 97093512.

The previous prime is 99790589. The next prime is 99790609. The reversal of 99790591 is 19509799.

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 99790591 - 2¹ = 99790589 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 (99790511) 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, 1348485 + ... + 1348558.

It is an arithmetic number, because the mean of its divisors is an integer number (25621918).

Almost surely, 2^99790591 is an apocalyptic number.

99790591 is a deficient number, since it is larger than the sum of its proper divisors (2697081).

99790591 is a wasteful number, since it uses less digits than its factorization.

99790591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697080.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 99790591 is about 9989.5240627369. The cubic root of 99790591 is about 463.8346601129.

The spelling of 99790591 in words is "ninety-nine million, seven hundred ninety thousand, five hundred ninety-one".