68815251 has 10 divisors (see below), whose sum is σ = 102798212. Its totient is φ = 45876780.

The previous prime is 68815249. The next prime is 68815291. The reversal of 68815251 is 15251886.

It is not a de Polignac number, because 68815251 - 2¹ = 68815249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68815211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 424705 + ... + 424866.

Almost surely, 2^68815251 is an apocalyptic number.

68815251 is a deficient number, since it is larger than the sum of its proper divisors (33982961).

68815251 is an equidigital number, since it uses as much as digits as its factorization.

68815251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849583 (or 849574 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 68815251 is about 8295.4958260492. The cubic root of 68815251 is about 409.7901980339.

The spelling of 68815251 in words is "sixty-eight million, eight hundred fifteen thousand, two hundred fifty-one".