68645131 has 2 divisors, whose sum is σ = 68645132. Its totient is φ = 68645130.

The previous prime is 68645107. The next prime is 68645147. The reversal of 68645131 is 13154686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68645131 - 2¹⁷ = 68514059 is a prime.

It is a super-3 number, since 3×68645131³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (68645431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34322565 + 34322566.

It is an arithmetic number, because the mean of its divisors is an integer number (34322566).

Almost surely, 2^68645131 is an apocalyptic number.

68645131 is a deficient number, since it is larger than the sum of its proper divisors (1).

68645131 is an equidigital number, since it uses as much as digits as its factorization.

68645131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 68645131 is about 8285.2357238645. The cubic root of 68645131 is about 409.4522349934.

The spelling of 68645131 in words is "sixty-eight million, six hundred forty-five thousand, one hundred thirty-one".