68137971 has 32 divisors (see below), whose sum is σ = 105388800. Its totient is φ = 38724480.

The previous prime is 68137967. The next prime is 68137987. The reversal of 68137971 is 17973186.

It is not a de Polignac number, because 68137971 - 2² = 68137967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68137931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67845 + ... + 68841.

It is an arithmetic number, because the mean of its divisors is an integer number (3293400).

Almost surely, 2^68137971 is an apocalyptic number.

68137971 is a deficient number, since it is larger than the sum of its proper divisors (37250829).

68137971 is a wasteful number, since it uses less digits than its factorization.

68137971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

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

The square root of 68137971 is about 8254.5727327343. The cubic root of 68137971 is about 408.4413776380.

The spelling of 68137971 in words is "sixty-eight million, one hundred thirty-seven thousand, nine hundred seventy-one".