81151273 has 8 divisors (see below), whose sum is σ = 95736320. Its totient is φ = 67314240.

The previous prime is 81151247. The next prime is 81151283. The reversal of 81151273 is 37215118.

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

It is not a de Polignac number, because 81151273 - 2¹³ = 81143081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81151283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186768 + ... + 187201.

It is an arithmetic number, because the mean of its divisors is an integer number (11967040).

Almost surely, 2^81151273 is an apocalyptic number.

It is an amenable number.

81151273 is a deficient number, since it is larger than the sum of its proper divisors (14585047).

81151273 is a wasteful number, since it uses less digits than its factorization.

81151273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374007.

The product of its digits is 1680, while the sum is 28.

The square root of 81151273 is about 9008.4001354292. The cubic root of 81151273 is about 432.9440534899.

The spelling of 81151273 in words is "eighty-one million, one hundred fifty-one thousand, two hundred seventy-three".