81952142 has 8 divisors (see below), whose sum is σ = 123071016. Its totient is φ = 40928472.

The previous prime is 81952139. The next prime is 81952147. The reversal of 81952142 is 24125918.

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

It is a junction number, because it is equal to n+sod(n) for n = 81952099 and 81952108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81952147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21608 + ... + 25115.

It is an arithmetic number, because the mean of its divisors is an integer number (15383877).

Almost surely, 2^81952142 is an apocalyptic number.

81952142 is a deficient number, since it is larger than the sum of its proper divisors (41118874).

81952142 is a wasteful number, since it uses less digits than its factorization.

81952142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47602.

The product of its digits is 5760, while the sum is 32.

The square root of 81952142 is about 9052.7422364718. The cubic root of 81952142 is about 434.3636125372.

The spelling of 81952142 in words is "eighty-one million, nine hundred fifty-two thousand, one hundred forty-two".