81182451 has 16 divisors (see below), whose sum is σ = 123847424. Its totient is φ = 46337184.

The previous prime is 81182447. The next prime is 81182467. The reversal of 81182451 is 15428118.

It is a happy number.

It is not a de Polignac number, because 81182451 - 2² = 81182447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81182411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23880 + ... + 27066.

It is an arithmetic number, because the mean of its divisors is an integer number (7740464).

Almost surely, 2^81182451 is an apocalyptic number.

81182451 is a deficient number, since it is larger than the sum of its proper divisors (42664973).

81182451 is a wasteful number, since it uses less digits than its factorization.

81182451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410.

The product of its digits is 2560, while the sum is 30.

The square root of 81182451 is about 9010.1304652042. The cubic root of 81182451 is about 432.9994915251. Note that the first 3 decimals are identical.

The spelling of 81182451 in words is "eighty-one million, one hundred eighty-two thousand, four hundred fifty-one".