81252874 has 4 divisors (see below), whose sum is σ = 121879314. Its totient is φ = 40626436.

The previous prime is 81252841. The next prime is 81252893. The reversal of 81252874 is 47825218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 79334649 + 1918225 = 8907^2 + 1385^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20313217 + ... + 20313220.

Almost surely, 2^81252874 is an apocalyptic number.

81252874 is a deficient number, since it is larger than the sum of its proper divisors (40626440).

81252874 is a wasteful number, since it uses less digits than its factorization.

81252874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40626439.

The product of its digits is 35840, while the sum is 37.

The square root of 81252874 is about 9014.0376080866. The cubic root of 81252874 is about 433.1246594229.

The spelling of 81252874 in words is "eighty-one million, two hundred fifty-two thousand, eight hundred seventy-four".