81525074 has 8 divisors (see below), whose sum is σ = 122462220. Its totient is φ = 40704336.

The previous prime is 81524999. The next prime is 81525089. The reversal of 81525074 is 47052518.

It can be written as a sum of positive squares in 2 ways, for example, as 76440049 + 5085025 = 8743^2 + 2255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81525074.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27329 + ... + 30164.

Almost surely, 2^81525074 is an apocalyptic number.

81525074 is a deficient number, since it is larger than the sum of its proper divisors (40937146).

81525074 is a wasteful number, since it uses less digits than its factorization.

81525074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58204.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 81525074 is about 9029.1236562581. The cubic root of 81525074 is about 433.6077813051.

The spelling of 81525074 in words is "eighty-one million, five hundred twenty-five thousand, seventy-four".