68137917 has 4 divisors (see below), whose sum is σ = 90850560. Its totient is φ = 45425276.

The previous prime is 68137903. The next prime is 68137931. The reversal of 68137917 is 71973186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (68137903) and next prime (68137931).

It is a cyclic number.

It is not a de Polignac number, because 68137917 - 2⁷ = 68137789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68137957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11356317 + ... + 11356322.

It is an arithmetic number, because the mean of its divisors is an integer number (22712640).

Almost surely, 2^68137917 is an apocalyptic number.

It is an amenable number.

68137917 is a deficient number, since it is larger than the sum of its proper divisors (22712643).

68137917 is a wasteful number, since it uses less digits than its factorization.

68137917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22712642.

The product of its digits is 63504, while the sum is 42.

The square root of 68137917 is about 8254.5694618193. The cubic root of 68137917 is about 408.4412697401.

The spelling of 68137917 in words is "sixty-eight million, one hundred thirty-seven thousand, nine hundred seventeen".