81246625 has 32 divisors (see below), whose sum is σ = 105670656. Its totient is φ = 62320000.

The previous prime is 81246619. The next prime is 81246637. The reversal of 81246625 is 52664218.

It is not a de Polignac number, because 81246625 - 2⁷ = 81246497 is a prime.

It is a Duffinian number.

Its product of digits (23040) is a multiple of the sum of its prime divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425280 + ... + 425470.

It is an arithmetic number, because the mean of its divisors is an integer number (3302208).

Almost surely, 2^81246625 is an apocalyptic number.

It is an amenable number.

81246625 is a deficient number, since it is larger than the sum of its proper divisors (24424031).

81246625 is a wasteful number, since it uses less digits than its factorization.

81246625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 320 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 81246625 is about 9013.6909753996. The cubic root of 81246625 is about 433.1135555475.

The spelling of 81246625 in words is "eighty-one million, two hundred forty-six thousand, six hundred twenty-five".