81011952 has 60 divisors (see below), whose sum is σ = 259112880. Its totient is φ = 23145984.

The previous prime is 81011951. The next prime is 81011971. The reversal of 81011952 is 25911018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81011951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39177 + ... + 41192.

It is an arithmetic number, because the mean of its divisors is an integer number (4318548).

Almost surely, 2^81011952 is an apocalyptic number.

It is an amenable number.

81011952 is an abundant number, since it is smaller than the sum of its proper divisors (178100928).

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

81011952 is a wasteful number, since it uses less digits than its factorization.

81011952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80390 (or 80381 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 81011952 is about 9000.6639755076. The cubic root of 81011952 is about 432.6961512392.

The spelling of 81011952 in words is "eighty-one million, eleven thousand, nine hundred fifty-two".