68199731 has 2 divisors, whose sum is σ = 68199732. Its totient is φ = 68199730.

The previous prime is 68199713. The next prime is 68199749. The reversal of 68199731 is 13799186.

Together with previous prime (68199713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (68199713) and next prime (68199749).

It is a cyclic number.

It is not a de Polignac number, because 68199731 - 2⁶ = 68199667 is a prime.

It is a super-2 number, since 2×68199731² = 9302406616944722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68199751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34099865 + 34099866.

It is an arithmetic number, because the mean of its divisors is an integer number (34099866).

Almost surely, 2^68199731 is an apocalyptic number.

68199731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68199731 is an equidigital number, since it uses as much as digits as its factorization.

68199731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 68199731 is about 8258.3128422215. The cubic root of 68199731 is about 408.5647436143.

The spelling of 68199731 in words is "sixty-eight million, one hundred ninety-nine thousand, seven hundred thirty-one".