99131887 has 2 divisors, whose sum is σ = 99131888. Its totient is φ = 99131886.

The previous prime is 99131869. The next prime is 99131897. The reversal of 99131887 is 78813199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99131887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99131827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49565943 + 49565944.

It is an arithmetic number, because the mean of its divisors is an integer number (49565944).

Almost surely, 2^99131887 is an apocalyptic number.

99131887 is a deficient number, since it is larger than the sum of its proper divisors (1).

99131887 is an equidigital number, since it uses as much as digits as its factorization.

99131887 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 99131887 is about 9956.4997363531. The cubic root of 99131887 is about 462.8118366438.

The spelling of 99131887 in words is "ninety-nine million, one hundred thirty-one thousand, eight hundred eighty-seven".