81612254 has 8 divisors (see below), whose sum is σ = 122770200. Its totient is φ = 40688856.

The previous prime is 81612241. The next prime is 81612259. The reversal of 81612254 is 45221618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81612259) 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 3 ways as a sum of consecutive naturals, for example, 57764 + ... + 59159.

It is an arithmetic number, because the mean of its divisors is an integer number (15346275).

Almost surely, 2^81612254 is an apocalyptic number.

81612254 is a deficient number, since it is larger than the sum of its proper divisors (41157946).

81612254 is a wasteful number, since it uses less digits than its factorization.

81612254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117274.

The product of its digits is 3840, while the sum is 29.

The square root of 81612254 is about 9033.9500773471. The cubic root of 81612254 is about 433.7622877976.

The spelling of 81612254 in words is "eighty-one million, six hundred twelve thousand, two hundred fifty-four".