98131987 has 2 divisors, whose sum is σ = 98131988. Its totient is φ = 98131986.

The previous prime is 98131951. The next prime is 98132003. The reversal of 98131987 is 78913189.

It is a strong prime.

It is an emirp because it is prime and its reverse (78913189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98131987 is a prime.

It is not a weakly prime, because it can be changed into another prime (98131487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49065993 + 49065994.

It is an arithmetic number, because the mean of its divisors is an integer number (49065994).

Almost surely, 2^98131987 is an apocalyptic number.

98131987 is a deficient number, since it is larger than the sum of its proper divisors (1).

98131987 is an equidigital number, since it uses as much as digits as its factorization.

98131987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 98131987 is about 9906.1590437465. The cubic root of 98131987 is about 461.2505151494.

The spelling of 98131987 in words is "ninety-eight million, one hundred thirty-one thousand, nine hundred eighty-seven".