81249032 has 16 divisors (see below), whose sum is σ = 154178640. Its totient is φ = 40134736.

The previous prime is 81249019. The next prime is 81249037. The reversal of 81249032 is 23094218.

It is a junction number, because it is equal to n+sod(n) for n = 81248986 and 81249004.

It is not an unprimeable number, because it can be changed into a prime (81249037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60518 + ... + 61845.

It is an arithmetic number, because the mean of its divisors is an integer number (9636165).

Almost surely, 2^81249032 is an apocalyptic number.

It is an amenable number.

81249032 is a deficient number, since it is larger than the sum of its proper divisors (72929608).

81249032 is a wasteful number, since it uses less digits than its factorization.

81249032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122452 (or 122448 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 81249032 is about 9013.8244935210. The cubic root of 81249032 is about 433.1178326237.

The spelling of 81249032 in words is "eighty-one million, two hundred forty-nine thousand, thirty-two".