81965142 has 48 divisors (see below), whose sum is σ = 211889520. Its totient is φ = 23417856.

The previous prime is 81965141. The next prime is 81965153. The reversal of 81965142 is 24156918.

It is a junction number, because it is equal to n+sod(n) for n = 81965097 and 81965106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81965141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12843 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (4414365).

Almost surely, 2^81965142 is an apocalyptic number.

81965142 is an abundant number, since it is smaller than the sum of its proper divisors (129924378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81965142 is a wasteful number, since it uses less digits than its factorization.

81965142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31002 (or 30989 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81965142 is about 9053.4602224785. The cubic root of 81965142 is about 434.3865789022.

The spelling of 81965142 in words is "eighty-one million, nine hundred sixty-five thousand, one hundred forty-two".