81519342 has 16 divisors (see below), whose sum is σ = 163535232. Its totient is φ = 27090360.

The previous prime is 81519331. The next prime is 81519371. The reversal of 81519342 is 24391518.

It is a super-2 number, since 2×81519342² = 13290806240225928, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 18538 + ... + 22509.

It is an arithmetic number, because the mean of its divisors is an integer number (10220952).

Almost surely, 2^81519342 is an apocalyptic number.

81519342 is an abundant number, since it is smaller than the sum of its proper divisors (82015890).

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

81519342 is a wasteful number, since it uses less digits than its factorization.

81519342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41383.

The product of its digits is 8640, while the sum is 33.

The square root of 81519342 is about 9028.8062333843. The cubic root of 81519342 is about 433.5976187954.

The spelling of 81519342 in words is "eighty-one million, five hundred nineteen thousand, three hundred forty-two".