98987831 has 2 divisors, whose sum is σ = 98987832. Its totient is φ = 98987830.

The previous prime is 98987827. The next prime is 98987857. The reversal of 98987831 is 13878989.

It is a weak prime.

It is an emirp because it is prime and its reverse (13878989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98987831 - 2² = 98987827 is a prime.

It is a super-2 number, since 2×98987831² = 19597181372169122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98987881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49493915 + 49493916.

It is an arithmetic number, because the mean of its divisors is an integer number (49493916).

Almost surely, 2^98987831 is an apocalyptic number.

98987831 is a deficient number, since it is larger than the sum of its proper divisors (1).

98987831 is an equidigital number, since it uses as much as digits as its factorization.

98987831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 98987831 is about 9949.2628370146. The cubic root of 98987831 is about 462.5875457358.

The spelling of 98987831 in words is "ninety-eight million, nine hundred eighty-seven thousand, eight hundred thirty-one".