81254252 has 6 divisors (see below), whose sum is σ = 142194948. Its totient is φ = 40627124.

The previous prime is 81254231. The next prime is 81254267. The reversal of 81254252 is 25245218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156778 + ... + 10156785.

It is an arithmetic number, because the mean of its divisors is an integer number (23699158).

Almost surely, 2^81254252 is an apocalyptic number.

It is an amenable number.

81254252 is a deficient number, since it is larger than the sum of its proper divisors (60940696).

81254252 is a wasteful number, since it uses less digits than its factorization.

81254252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20313567 (or 20313565 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 81254252 is about 9014.1140440977. The cubic root of 81254252 is about 433.1271079206.

The spelling of 81254252 in words is "eighty-one million, two hundred fifty-four thousand, two hundred fifty-two".