68132581 has 4 divisors (see below), whose sum is σ = 74326464. Its totient is φ = 61938700.

The previous prime is 68132569. The next prime is 68132587. The reversal of 68132581 is 18523186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68132581 - 2⁷ = 68132453 is a prime.

It is a super-2 number, since 2×68132581² = 9284097187443122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68132587) 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, 3096925 + ... + 3096946.

It is an arithmetic number, because the mean of its divisors is an integer number (18581616).

Almost surely, 2^68132581 is an apocalyptic number.

It is an amenable number.

68132581 is a deficient number, since it is larger than the sum of its proper divisors (6193883).

68132581 is a wasteful number, since it uses less digits than its factorization.

68132581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6193882.

The product of its digits is 11520, while the sum is 34.

The square root of 68132581 is about 8254.2462405722. The cubic root of 68132581 is about 408.4306075439.

The spelling of 68132581 in words is "sixty-eight million, one hundred thirty-two thousand, five hundred eighty-one".