68423581 has 2 divisors, whose sum is σ = 68423582. Its totient is φ = 68423580.

The previous prime is 68423573. The next prime is 68423599. The reversal of 68423581 is 18532486.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 443556 = 8245^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 68423581 - 2³ = 68423573 is a prime.

It is a super-2 number, since 2×68423581² = 9363572873727122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68423581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68423081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34211790 + 34211791.

It is an arithmetic number, because the mean of its divisors is an integer number (34211791).

Almost surely, 2^68423581 is an apocalyptic number.

It is an amenable number.

68423581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68423581 is an equidigital number, since it uses as much as digits as its factorization.

68423581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 68423581 is about 8271.8547496919. The cubic root of 68423581 is about 409.0112621764.

The spelling of 68423581 in words is "sixty-eight million, four hundred twenty-three thousand, five hundred eighty-one".