81613254 has 8 divisors (see below), whose sum is σ = 163226520. Its totient is φ = 27204416.

The previous prime is 81613219. The next prime is 81613261. The reversal of 81613254 is 45231618.

It is a sphenic number, since it is the product of 3 distinct primes.

81613254 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6801099 + ... + 6801110.

It is an arithmetic number, because the mean of its divisors is an integer number (20403315).

Almost surely, 2^81613254 is an apocalyptic number.

81613254 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81613254 is a wasteful number, since it uses less digits than its factorization.

81613254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13602214.

The product of its digits is 5760, while the sum is 30.

The square root of 81613254 is about 9034.0054239523. The cubic root of 81613254 is about 433.7640594291.

The spelling of 81613254 in words is "eighty-one million, six hundred thirteen thousand, two hundred fifty-four".