68516731 has 2 divisors, whose sum is σ = 68516732. Its totient is φ = 68516730.

The previous prime is 68516729. The next prime is 68516753. The reversal of 68516731 is 13761586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68516731 - 2¹ = 68516729 is a prime.

It is a super-2 number, since 2×68516731² = 9389084853852722, which contains 22 as substring.

Together with 68516729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68516761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258365 + 34258366.

It is an arithmetic number, because the mean of its divisors is an integer number (34258366).

Almost surely, 2^68516731 is an apocalyptic number.

68516731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68516731 is an equidigital number, since it uses as much as digits as its factorization.

68516731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 68516731 is about 8277.4833735864. The cubic root of 68516731 is about 409.1967836122.

The spelling of 68516731 in words is "sixty-eight million, five hundred sixteen thousand, seven hundred thirty-one".