81522652 has 24 divisors (see below), whose sum is σ = 145389440. Its totient is φ = 39988080.

The previous prime is 81522643. The next prime is 81522671. The reversal of 81522652 is 25622518.

It is a super-2 number, since 2×81522652² = 13291885578226208, 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88249 + ... + 89167.

Almost surely, 2^81522652 is an apocalyptic number.

It is an amenable number.

81522652 is a deficient number, since it is larger than the sum of its proper divisors (63866788).

81522652 is a wasteful number, since it uses less digits than its factorization.

81522652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1319 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 81522652 is about 9028.9895337186. The cubic root of 81522652 is about 433.6034872951.

The spelling of 81522652 in words is "eighty-one million, five hundred twenty-two thousand, six hundred fifty-two".