81130534 has 8 divisors (see below), whose sum is σ = 125621568. Its totient is φ = 39256680.

The previous prime is 81130519. The next prime is 81130541. The reversal of 81130534 is 43503118.

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

It is a super-3 number, since 3×81130534³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81130499 and 81130508.

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, 654217 + ... + 654340.

It is an arithmetic number, because the mean of its divisors is an integer number (15702696).

Almost surely, 2^81130534 is an apocalyptic number.

81130534 is a deficient number, since it is larger than the sum of its proper divisors (44491034).

81130534 is a wasteful number, since it uses less digits than its factorization.

81130534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308590.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 81130534 is about 9007.2489695800. The cubic root of 81130534 is about 432.9071693213.

The spelling of 81130534 in words is "eighty-one million, one hundred thirty thousand, five hundred thirty-four".