81144274 has 8 divisors (see below), whose sum is σ = 123711948. Its totient is φ = 39906960.

The previous prime is 81144263. The next prime is 81144277. The reversal of 81144274 is 47244118.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81126049 + 18225 = 9007^2 + 135^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81144277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332437 + ... + 332680.

Almost surely, 2^81144274 is an apocalyptic number.

81144274 is a deficient number, since it is larger than the sum of its proper divisors (42567674).

81144274 is a wasteful number, since it uses less digits than its factorization.

81144274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665180.

The product of its digits is 7168, while the sum is 31.

The square root of 81144274 is about 9008.0116562980. The cubic root of 81144274 is about 432.9316065192.

It can be divided in two parts, 81144 and 274, that added together give a palindrome (81418).

The spelling of 81144274 in words is "eighty-one million, one hundred forty-four thousand, two hundred seventy-four".