81255124 has 6 divisors (see below), whose sum is σ = 142196474. Its totient is φ = 40627560.

The previous prime is 81255103. The next prime is 81255127. The reversal of 81255124 is 42155218.

It can be written as a sum of positive squares in only one way, i.e., 71707024 + 9548100 = 8468^2 + 3090^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81255092 and 81255101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81255127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156887 + ... + 10156894.

Almost surely, 2^81255124 is an apocalyptic number.

It is an amenable number.

81255124 is a deficient number, since it is larger than the sum of its proper divisors (60941350).

81255124 is a wasteful number, since it uses less digits than its factorization.

81255124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20313785 (or 20313783 counting only the distinct ones).

The product of its digits is 3200, while the sum is 28.

The square root of 81255124 is about 9014.1624125595. The cubic root of 81255124 is about 433.1286573184.

The spelling of 81255124 in words is "eighty-one million, two hundred fifty-five thousand, one hundred twenty-four".