81460825 has 12 divisors (see below), whose sum is σ = 105403968. Its totient is φ = 62334800.

The previous prime is 81460817. The next prime is 81460829. The reversal of 81460825 is 52806418.

It is not a de Polignac number, because 81460825 - 2³ = 81460817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81460829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70261 + ... + 71410.

It is an arithmetic number, because the mean of its divisors is an integer number (8783664).

Almost surely, 2^81460825 is an apocalyptic number.

It is an amenable number.

81460825 is a deficient number, since it is larger than the sum of its proper divisors (23943143).

81460825 is a wasteful number, since it uses less digits than its factorization.

81460825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141704 (or 141699 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81460825 is about 9025.5650792624. The cubic root of 81460825 is about 433.4938442197.

The spelling of 81460825 in words is "eighty-one million, four hundred sixty thousand, eight hundred twenty-five".