81474134 has 16 divisors (see below), whose sum is σ = 143077536. Its totient is φ = 34065600.

The previous prime is 81474067. The next prime is 81474139. The reversal of 81474134 is 43147418.

It is a super-2 number, since 2×81474134² = 13276069022099912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81474134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81474139) 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, 70397 + ... + 71544.

It is an arithmetic number, because the mean of its divisors is an integer number (8942346).

Almost surely, 2^81474134 is an apocalyptic number.

81474134 is a deficient number, since it is larger than the sum of its proper divisors (61603402).

81474134 is a wasteful number, since it uses less digits than its factorization.

81474134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141991.

The product of its digits is 10752, while the sum is 32.

The square root of 81474134 is about 9026.3023437064. The cubic root of 81474134 is about 433.5174508854.

The spelling of 81474134 in words is "eighty-one million, four hundred seventy-four thousand, one hundred thirty-four".