81050252 has 12 divisors (see below), whose sum is σ = 148004976. Its totient is φ = 38763120.

The previous prime is 81050251. The next prime is 81050261. The reversal of 81050252 is 25205018.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (81050251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440399 + ... + 440582.

It is an arithmetic number, because the mean of its divisors is an integer number (12333748).

Almost surely, 2^81050252 is an apocalyptic number.

It is an amenable number.

81050252 is a deficient number, since it is larger than the sum of its proper divisors (66954724).

81050252 is a wasteful number, since it uses less digits than its factorization.

81050252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881008 (or 881006 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 81050252 is about 9002.7913449108. The cubic root of 81050252 is about 432.7643290461.

The spelling of 81050252 in words is "eighty-one million, fifty thousand, two hundred fifty-two".