99970831 has 2 divisors, whose sum is σ = 99970832. Its totient is φ = 99970830.

The previous prime is 99970813. The next prime is 99970841. The reversal of 99970831 is 13807999.

Together with previous prime (99970813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13807999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99970831 is a prime.

It is a super-2 number, since 2×99970831² = 19988334101661122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99970841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49985415 + 49985416.

It is an arithmetic number, because the mean of its divisors is an integer number (49985416).

Almost surely, 2^99970831 is an apocalyptic number.

99970831 is a deficient number, since it is larger than the sum of its proper divisors (1).

99970831 is an equidigital number, since it uses as much as digits as its factorization.

99970831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 99970831 is about 9998.5414436307. The cubic root of 99970831 is about 464.1137488043.

The spelling of 99970831 in words is "ninety-nine million, nine hundred seventy thousand, eight hundred thirty-one".