81125854 has 12 divisors (see below), whose sum is σ = 124411824. Its totient is φ = 39657152.

The previous prime is 81125851. The next prime is 81125857. The reversal of 81125854 is 45852118.

It is an interprime number because it is at equal distance from previous prime (81125851) and next prime (81125857).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81125851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86862 + ... + 87790.

It is an arithmetic number, because the mean of its divisors is an integer number (10367652).

Almost surely, 2^81125854 is an apocalyptic number.

81125854 is a deficient number, since it is larger than the sum of its proper divisors (43285970).

81125854 is an frugal number, since it uses more digits than its factorization.

81125854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907 (or 978 counting only the distinct ones).

The product of its digits is 12800, while the sum is 34.

The square root of 81125854 is about 9006.9891750795. The cubic root of 81125854 is about 432.8988451043.

The spelling of 81125854 in words is "eighty-one million, one hundred twenty-five thousand, eight hundred fifty-four".