81124570 has 16 divisors (see below), whose sum is σ = 147077280. Its totient is φ = 32215824.

The previous prime is 81124567. The next prime is 81124577. The reversal of 81124570 is 7542118.

It is not an unprimeable number, because it can be changed into a prime (81124577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27792 + ... + 30571.

It is an arithmetic number, because the mean of its divisors is an integer number (9192330).

Almost surely, 2^81124570 is an apocalyptic number.

81124570 is a deficient number, since it is larger than the sum of its proper divisors (65952710).

81124570 is a wasteful number, since it uses less digits than its factorization.

81124570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58509.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 81124570 is about 9006.9178968169. The cubic root of 81124570 is about 432.8965612247.

Adding to 81124570 its reverse (7542118), we get a palindrome (88666688).

The spelling of 81124570 in words is "eighty-one million, one hundred twenty-four thousand, five hundred seventy".