68817731 has 2 divisors, whose sum is σ = 68817732. Its totient is φ = 68817730.

The previous prime is 68817713. The next prime is 68817733. The reversal of 68817731 is 13771886.

Together with previous prime (68817713) 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 68817731 - 2¹⁴ = 68801347 is a prime.

It is a super-2 number, since 2×68817731² = 9471760199976722, which contains 22 as substring.

Together with 68817733, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (68817733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34408865 + 34408866.

It is an arithmetic number, because the mean of its divisors is an integer number (34408866).

Almost surely, 2^68817731 is an apocalyptic number.

68817731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68817731 is an equidigital number, since it uses as much as digits as its factorization.

68817731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 68817731 is about 8295.6453034107. The cubic root of 68817731 is about 409.7951207192.

The spelling of 68817731 in words is "sixty-eight million, eight hundred seventeen thousand, seven hundred thirty-one".