81480925 has 6 divisors (see below), whose sum is σ = 101036378. Its totient is φ = 65184720.

The previous prime is 81480913. The next prime is 81480937. The reversal of 81480925 is 52908418.

It is an interprime number because it is at equal distance from previous prime (81480913) and next prime (81480937).

It can be written as a sum of positive squares in 3 ways, for example, as 3229209 + 78251716 = 1797^2 + 8846^2 .

It is a de Polignac number, because none of the positive numbers 2^k-81480925 is a prime.

It is a super-2 number, since 2×81480925² = 13278282277711250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1629594 + ... + 1629643.

Almost surely, 2^81480925 is an apocalyptic number.

It is an amenable number.

81480925 is a deficient number, since it is larger than the sum of its proper divisors (19555453).

81480925 is a wasteful number, since it uses less digits than its factorization.

81480925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259247 (or 3259242 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81480925 is about 9026.6785142709. The cubic root of 81480925 is about 433.5294953428.

The spelling of 81480925 in words is "eighty-one million, four hundred eighty thousand, nine hundred twenty-five".