81913654 has 8 divisors (see below), whose sum is σ = 125867448. Its totient is φ = 39957840.

The previous prime is 81913627. The next prime is 81913669. The reversal of 81913654 is 45631918.

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

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, 499392 + ... + 499555.

It is an arithmetic number, because the mean of its divisors is an integer number (15733431).

Almost surely, 2^81913654 is an apocalyptic number.

81913654 is a deficient number, since it is larger than the sum of its proper divisors (43953794).

81913654 is a wasteful number, since it uses less digits than its factorization.

81913654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998990.

The product of its digits is 25920, while the sum is 37.

The square root of 81913654 is about 9050.6162221144. The cubic root of 81913654 is about 434.2956037209.

The spelling of 81913654 in words is "eighty-one million, nine hundred thirteen thousand, six hundred fifty-four".