81547152 has 40 divisors (see below), whose sum is σ = 211474560. Its totient is φ = 27077760.

The previous prime is 81547133. The next prime is 81547171. The reversal of 81547152 is 25174518.

It is an interprime number because it is at equal distance from previous prime (81547133) and next prime (81547171).

It is a super-2 number, since 2×81547152² = 13299875998622208, 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9874 + ... + 16142.

It is an arithmetic number, because the mean of its divisors is an integer number (5286864).

Almost surely, 2^81547152 is an apocalyptic number.

It is an amenable number.

81547152 is an abundant number, since it is smaller than the sum of its proper divisors (129927408).

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

81547152 is a wasteful number, since it uses less digits than its factorization.

81547152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551 (or 6545 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

The square root of 81547152 is about 9030.3461727666. The cubic root of 81547152 is about 433.6469198919.

The spelling of 81547152 in words is "eighty-one million, five hundred forty-seven thousand, one hundred fifty-two".