81149734 has 8 divisors (see below), whose sum is σ = 123439248. Its totient is φ = 40003320.

The previous prime is 81149711. The next prime is 81149749. The reversal of 81149734 is 43794118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81149693 and 81149702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285597 + ... + 285880.

It is an arithmetic number, because the mean of its divisors is an integer number (15429906).

Almost surely, 2^81149734 is an apocalyptic number.

81149734 is a deficient number, since it is larger than the sum of its proper divisors (42289514).

81149734 is a wasteful number, since it uses less digits than its factorization.

81149734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571550.

The product of its digits is 24192, while the sum is 37.

The square root of 81149734 is about 9008.3147147510. The cubic root of 81149734 is about 432.9413166049.

The spelling of 81149734 in words is "eighty-one million, one hundred forty-nine thousand, seven hundred thirty-four".