81213926 has 8 divisors (see below), whose sum is σ = 121992480. Its totient is φ = 40549768.

The previous prime is 81213919. The next prime is 81213931. The reversal of 81213926 is 62931218.

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

It is a junction number, because it is equal to n+sod(n) for n = 81213892 and 81213901.

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, 26801 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (15249060).

Almost surely, 2^81213926 is an apocalyptic number.

81213926 is a deficient number, since it is larger than the sum of its proper divisors (40778554).

81213926 is a wasteful number, since it uses less digits than its factorization.

81213926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57198.

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

The square root of 81213926 is about 9011.8769410151. The cubic root of 81213926 is about 433.0554432647.

The spelling of 81213926 in words is "eighty-one million, two hundred thirteen thousand, nine hundred twenty-six".