81474158 has 4 divisors (see below), whose sum is σ = 122211240. Its totient is φ = 40737078.

The previous prime is 81474143. The next prime is 81474161. The reversal of 81474158 is 85147418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20368538 + ... + 20368541.

It is an arithmetic number, because the mean of its divisors is an integer number (30552810).

Almost surely, 2^81474158 is an apocalyptic number.

81474158 is a deficient number, since it is larger than the sum of its proper divisors (40737082).

81474158 is a wasteful number, since it uses less digits than its factorization.

81474158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40737081.

The product of its digits is 35840, while the sum is 38.

The square root of 81474158 is about 9026.3036731544. The cubic root of 81474158 is about 433.5174934528.

The spelling of 81474158 in words is "eighty-one million, four hundred seventy-four thousand, one hundred fifty-eight".