81502325 has 24 divisors (see below), whose sum is σ = 105945600. Its totient is φ = 62112960.

The previous prime is 81502313. The next prime is 81502327. The reversal of 81502325 is 52320518.

It is not a de Polignac number, because 81502325 - 2²⁴ = 64725109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81502294 and 81502303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81502327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56564 + ... + 57986.

It is an arithmetic number, because the mean of its divisors is an integer number (4414400).

Almost surely, 2^81502325 is an apocalyptic number.

It is an amenable number.

81502325 is a deficient number, since it is larger than the sum of its proper divisors (24443275).

81502325 is a wasteful number, since it uses less digits than its factorization.

81502325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541 (or 1536 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 81502325 is about 9027.8638115559. The cubic root of 81502325 is about 433.5674458166.

The spelling of 81502325 in words is "eighty-one million, five hundred two thousand, three hundred twenty-five".