68988131 has 4 divisors (see below), whose sum is σ = 69491832. Its totient is φ = 68484432.

The previous prime is 68988121. The next prime is 68988173. The reversal of 68988131 is 13188986.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68988131 is a prime.

It is a super-2 number, since 2×68988131² = 9518724437746322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68988121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251645 + ... + 251918.

It is an arithmetic number, because the mean of its divisors is an integer number (17372958).

Almost surely, 2^68988131 is an apocalyptic number.

68988131 is a deficient number, since it is larger than the sum of its proper divisors (503701).

68988131 is a wasteful number, since it uses less digits than its factorization.

68988131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503700.

The product of its digits is 82944, while the sum is 44.

The square root of 68988131 is about 8305.9094023472. The cubic root of 68988131 is about 410.1330739956.

The spelling of 68988131 in words is "sixty-eight million, nine hundred eighty-eight thousand, one hundred thirty-one".