81145274 has 12 divisors (see below), whose sum is σ = 141590394. Its totient is φ = 34776504.

The previous prime is 81145271. The next prime is 81145283. The reversal of 81145274 is 47254118.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 53509225 + 27636049 = 7315^2 + 5257^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81145274.

It is not an unprimeable number, because it can be changed into a prime (81145271) 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, 413909 + ... + 414104.

Almost surely, 2^81145274 is an apocalyptic number.

81145274 is a deficient number, since it is larger than the sum of its proper divisors (60445120).

81145274 is a wasteful number, since it uses less digits than its factorization.

81145274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828029 (or 828022 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 81145274 is about 9008.0671622718. The cubic root of 81145274 is about 432.9333849557.

The spelling of 81145274 in words is "eighty-one million, one hundred forty-five thousand, two hundred seventy-four".