81509482 has 4 divisors (see below), whose sum is σ = 122264226. Its totient is φ = 40754740.

The previous prime is 81509479. The next prime is 81509501. The reversal of 81509482 is 28490518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49575681 + 31933801 = 7041^2 + 5651^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20377369 + ... + 20377372.

Almost surely, 2^81509482 is an apocalyptic number.

81509482 is a deficient number, since it is larger than the sum of its proper divisors (40754744).

81509482 is a wasteful number, since it uses less digits than its factorization.

81509482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40754743.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81509482 is about 9028.2601867691. The cubic root of 81509482 is about 433.5801364622.

The spelling of 81509482 in words is "eighty-one million, five hundred nine thousand, four hundred eighty-two".