81124942 has 16 divisors (see below), whose sum is σ = 126567360. Its totient is φ = 38963808.

The previous prime is 81124931. The next prime is 81124949. The reversal of 81124942 is 24942118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81124949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093 + ... + 12784.

It is an arithmetic number, because the mean of its divisors is an integer number (7910460).

Almost surely, 2^81124942 is an apocalyptic number.

81124942 is a deficient number, since it is larger than the sum of its proper divisors (45442418).

81124942 is a wasteful number, since it uses less digits than its factorization.

81124942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13995.

The product of its digits is 4608, while the sum is 31.

The square root of 81124942 is about 9006.9385475865. The cubic root of 81124942 is about 432.8972229119.

The spelling of 81124942 in words is "eighty-one million, one hundred twenty-four thousand, nine hundred forty-two".