81277194 has 32 divisors (see below), whose sum is σ = 166634496. Its totient is φ = 26416880.

The previous prime is 81277127. The next prime is 81277223. The reversal of 81277194 is 49177218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138169 + ... + 138755.

It is an arithmetic number, because the mean of its divisors is an integer number (5207328).

Almost surely, 2^81277194 is an apocalyptic number.

81277194 is an abundant number, since it is smaller than the sum of its proper divisors (85357302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81277194 is a wasteful number, since it uses less digits than its factorization.

81277194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

The product of its digits is 28224, while the sum is 39.

The square root of 81277194 is about 9015.3865141767. The cubic root of 81277194 is about 433.1678683189.

The spelling of 81277194 in words is "eighty-one million, two hundred seventy-seven thousand, one hundred ninety-four".