81926554 has 8 divisors (see below), whose sum is σ = 124106868. Its totient is φ = 40557600.

The previous prime is 81926543. The next prime is 81926591. The reversal of 81926554 is 45562918.

It can be written as a sum of positive squares in 2 ways, for example, as 80550625 + 1375929 = 8975^2 + 1173^2 .

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

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, 202587 + ... + 202990.

Almost surely, 2^81926554 is an apocalyptic number.

81926554 is a deficient number, since it is larger than the sum of its proper divisors (42180314).

81926554 is a wasteful number, since it uses less digits than its factorization.

81926554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405680.

The product of its digits is 86400, while the sum is 40.

The square root of 81926554 is about 9051.3288527155. The cubic root of 81926554 is about 434.3184005684.

The spelling of 81926554 in words is "eighty-one million, nine hundred twenty-six thousand, five hundred fifty-four".