81240854 has 8 divisors (see below), whose sum is σ = 121980600. Its totient is φ = 40580656.

The previous prime is 81240851. The next prime is 81240857. The reversal of 81240854 is 45804218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81240851) and next prime (81240857).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81240854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81240851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17264 + ... + 21459.

It is an arithmetic number, because the mean of its divisors is an integer number (15247575).

Almost surely, 2^81240854 is an apocalyptic number.

81240854 is a deficient number, since it is larger than the sum of its proper divisors (40739746).

81240854 is a wasteful number, since it uses less digits than its factorization.

81240854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39774.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 81240854 is about 9013.3708455827. The cubic root of 81240854 is about 433.1033005266.

The spelling of 81240854 in words is "eighty-one million, two hundred forty thousand, eight hundred fifty-four".