81252142 has 8 divisors (see below), whose sum is σ = 126081000. Its totient is φ = 39225144.

The previous prime is 81252131. The next prime is 81252161. The reversal of 81252142 is 24125218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 700392 + ... + 700507.

It is an arithmetic number, because the mean of its divisors is an integer number (15760125).

Almost surely, 2^81252142 is an apocalyptic number.

81252142 is a deficient number, since it is larger than the sum of its proper divisors (44828858).

81252142 is a wasteful number, since it uses less digits than its factorization.

81252142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400930.

The product of its digits is 1280, while the sum is 25.

The square root of 81252142 is about 9013.9970046589. The cubic root of 81252142 is about 433.1233587584.

The spelling of 81252142 in words is "eighty-one million, two hundred fifty-two thousand, one hundred forty-two".