81201925 has 12 divisors (see below), whose sum is σ = 115074976. Its totient is φ = 55681200.

The previous prime is 81201917. The next prime is 81201929. The reversal of 81201925 is 52910218.

It is not a de Polignac number, because 81201925 - 2³ = 81201917 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81201893 and 81201902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81201929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231831 + ... + 232180.

Almost surely, 2^81201925 is an apocalyptic number.

It is an amenable number.

81201925 is a deficient number, since it is larger than the sum of its proper divisors (33873051).

81201925 is a wasteful number, since it uses less digits than its factorization.

81201925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464028 (or 464023 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 81201925 is about 9011.2110728803. The cubic root of 81201925 is about 433.0341113140.

The spelling of 81201925 in words is "eighty-one million, two hundred one thousand, nine hundred twenty-five".