68891131 has 4 divisors (see below), whose sum is σ = 72517000. Its totient is φ = 65265264.

The previous prime is 68891113. The next prime is 68891227. The reversal of 68891131 is 13119886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68891131 - 2⁵ = 68891099 is a prime.

It is a super-2 number, since 2×68891131² = 9491975860918322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68891231) 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, 1812906 + ... + 1812943.

It is an arithmetic number, because the mean of its divisors is an integer number (18129250).

Almost surely, 2^68891131 is an apocalyptic number.

68891131 is a deficient number, since it is larger than the sum of its proper divisors (3625869).

68891131 is a wasteful number, since it uses less digits than its factorization.

68891131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625868.

The product of its digits is 10368, while the sum is 37.

The square root of 68891131 is about 8300.0681322505. The cubic root of 68891131 is about 409.9407628080.

It can be divided in two parts, 688 and 91131, that added together give a palindrome (91819).

The spelling of 68891131 in words is "sixty-eight million, eight hundred ninety-one thousand, one hundred thirty-one".