81926132 has 6 divisors (see below), whose sum is σ = 143370738. Its totient is φ = 40963064.

The previous prime is 81926113. The next prime is 81926153. The reversal of 81926132 is 23162918.

It can be written as a sum of positive squares in only one way, i.e., 73376356 + 8549776 = 8566^2 + 2924^2 .

It is a super-2 number, since 2×81926132² = 13423782208962848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240763 + ... + 10240770.

It is an arithmetic number, because the mean of its divisors is an integer number (23895123).

Almost surely, 2^81926132 is an apocalyptic number.

It is an amenable number.

81926132 is a deficient number, since it is larger than the sum of its proper divisors (61444606).

81926132 is a wasteful number, since it uses less digits than its factorization.

81926132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20481537 (or 20481535 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 81926132 is about 9051.3055411913. The cubic root of 81926132 is about 434.3176548489.

The spelling of 81926132 in words is "eighty-one million, nine hundred twenty-six thousand, one hundred thirty-two".