81080425 has 12 divisors (see below), whose sum is σ = 100891980. Its totient is φ = 64637120.

The previous prime is 81080423. The next prime is 81080449. The reversal of 81080425 is 52408018.

It can be written as a sum of positive squares in 6 ways, for example, as 870489 + 80209936 = 933^2 + 8956^2 .

It is not a de Polignac number, because 81080425 - 2¹ = 81080423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81080393 and 81080402.

It is not an unprimeable number, because it can be changed into a prime (81080423) 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, 1791 + ... + 12859.

It is an arithmetic number, because the mean of its divisors is an integer number (8407665).

Almost surely, 2^81080425 is an apocalyptic number.

It is an amenable number.

81080425 is a deficient number, since it is larger than the sum of its proper divisors (19811555).

81080425 is a wasteful number, since it uses less digits than its factorization.

81080425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11372 (or 11367 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 81080425 is about 9004.4669470214. The cubic root of 81080425 is about 432.8180248614.

The spelling of 81080425 in words is "eighty-one million, eighty thousand, four hundred twenty-five".