98631591 has 4 divisors (see below), whose sum is σ = 131508792. Its totient is φ = 65754392.

The previous prime is 98631587. The next prime is 98631601. The reversal of 98631591 is 19513689.

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 98631591 - 2² = 98631587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98631191) 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, 16438596 + ... + 16438601.

It is an arithmetic number, because the mean of its divisors is an integer number (32877198).

Almost surely, 2^98631591 is an apocalyptic number.

98631591 is a deficient number, since it is larger than the sum of its proper divisors (32877201).

98631591 is a wasteful number, since it uses less digits than its factorization.

98631591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32877200.

The product of its digits is 58320, while the sum is 42.

The square root of 98631591 is about 9931.3438667685. The cubic root of 98631591 is about 462.0319546497.

The spelling of 98631591 in words is "ninety-eight million, six hundred thirty-one thousand, five hundred ninety-one".