81754245 has 32 divisors (see below), whose sum is σ = 152995200. Its totient is φ = 41306112.

The previous prime is 81754237. The next prime is 81754247. The reversal of 81754245 is 54245718.

It is not a de Polignac number, because 81754245 - 2³ = 81754237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81754247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13372 + ... + 18501.

It is an arithmetic number, because the mean of its divisors is an integer number (4781100).

Almost surely, 2^81754245 is an apocalyptic number.

It is an amenable number.

81754245 is a deficient number, since it is larger than the sum of its proper divisors (71240955).

81754245 is a wasteful number, since it uses less digits than its factorization.

81754245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31906 (or 31900 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 81754245 is about 9041.8054060016. The cubic root of 81754245 is about 434.0136988038.

The spelling of 81754245 in words is "eighty-one million, seven hundred fifty-four thousand, two hundred forty-five".