68099531 has 2 divisors, whose sum is σ = 68099532. Its totient is φ = 68099530.

The previous prime is 68099513. The next prime is 68099533. The reversal of 68099531 is 13599086.

Together with previous prime (68099513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68099531 - 2¹⁸ = 67837387 is a prime.

It is a super-2 number, since 2×68099531² = 9275092244839922, which contains 22 as substring.

Together with 68099533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68099533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34049765 + 34049766.

It is an arithmetic number, because the mean of its divisors is an integer number (34049766).

Almost surely, 2^68099531 is an apocalyptic number.

68099531 is a deficient number, since it is larger than the sum of its proper divisors (1).

68099531 is an equidigital number, since it uses as much as digits as its factorization.

68099531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 68099531 is about 8252.2439978469. The cubic root of 68099531 is about 408.3645558614.

The spelling of 68099531 in words is "sixty-eight million, ninety-nine thousand, five hundred thirty-one".