81352942 has 16 divisors (see below), whose sum is σ = 134622000. Its totient is φ = 36562240.

The previous prime is 81352919. The next prime is 81352967. The reversal of 81352942 is 24925318.

It is a junction number, because it is equal to n+sod(n) for n = 81352898 and 81352907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18817 + ... + 22732.

It is an arithmetic number, because the mean of its divisors is an integer number (8413875).

Almost surely, 2^81352942 is an apocalyptic number.

81352942 is a deficient number, since it is larger than the sum of its proper divisors (53269058).

81352942 is a wasteful number, since it uses less digits than its factorization.

81352942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41651.

The product of its digits is 17280, while the sum is 34.

The square root of 81352942 is about 9019.5865758914. The cubic root of 81352942 is about 433.3023931887.

The spelling of 81352942 in words is "eighty-one million, three hundred fifty-two thousand, nine hundred forty-two".