81124012190 has 64 divisors (see below), whose sum is σ = 162091649664. Its totient is φ = 29038238208.

The previous prime is 81124012159. The next prime is 81124012201. The reversal of 81124012190 is 9121042118.

It is a super-2 number, since 2×81124012190² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1301927 + ... + 1362813.

It is an arithmetic number, because the mean of its divisors is an integer number (2532682026).

Almost surely, 2^81124012190 is an apocalyptic number.

81124012190 is a deficient number, since it is larger than the sum of its proper divisors (80967637474).

81124012190 is a wasteful number, since it uses less digits than its factorization.

81124012190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61221.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 81124012190 in words is "eighty-one billion, one hundred twenty-four million, twelve thousand, one hundred ninety".