81929126 has 8 divisors (see below), whose sum is σ = 123186864. Its totient is φ = 40866840.

The previous prime is 81929119. The next prime is 81929153. The reversal of 81929126 is 62192918.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81929126.

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, 47810 + ... + 49493.

It is an arithmetic number, because the mean of its divisors is an integer number (15398358).

Almost surely, 2^81929126 is an apocalyptic number.

81929126 is a deficient number, since it is larger than the sum of its proper divisors (41257738).

81929126 is a wasteful number, since it uses less digits than its factorization.

81929126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97726.

The product of its digits is 15552, while the sum is 38.

The square root of 81929126 is about 9051.4709301859. The cubic root of 81929126 is about 434.3229455141.

It can be divided in two parts, 8192912 and 6, that added together give a palindrome (8192918).

The spelling of 81929126 in words is "eighty-one million, nine hundred twenty-nine thousand, one hundred twenty-six".