81500562 has 48 divisors (see below), whose sum is σ = 207462528. Its totient is φ = 22796640.

The previous prime is 81500561. The next prime is 81500563. The reversal of 81500562 is 26500518.

It is an interprime number because it is at equal distance from previous prime (81500561) and next prime (81500563).

It is not an unprimeable number, because it can be changed into a prime (81500561) 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, 13258 + ... + 18405.

It is an arithmetic number, because the mean of its divisors is an integer number (4322136).

Almost surely, 2^81500562 is an apocalyptic number.

81500562 is an abundant number, since it is smaller than the sum of its proper divisors (125961966).

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

81500562 is a wasteful number, since it uses less digits than its factorization.

81500562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31695 (or 31692 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 81500562 is about 9027.7661688814. The cubic root of 81500562 is about 433.5643195871.

The spelling of 81500562 in words is "eighty-one million, five hundred thousand, five hundred sixty-two".