81134187 has 8 divisors (see below), whose sum is σ = 108356160. Its totient is φ = 54000840.

The previous prime is 81134177. The next prime is 81134189. The reversal of 81134187 is 78143118.

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

It is not a de Polignac number, because 81134187 - 2¹⁶ = 81068651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81134189) 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, 19989 + ... + 23702.

It is an arithmetic number, because the mean of its divisors is an integer number (13544520).

Almost surely, 2^81134187 is an apocalyptic number.

81134187 is a deficient number, since it is larger than the sum of its proper divisors (27221973).

81134187 is a wasteful number, since it uses less digits than its factorization.

81134187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44313.

The product of its digits is 5376, while the sum is 33.

The square root of 81134187 is about 9007.4517484136. The cubic root of 81134187 is about 432.9136666126.

The spelling of 81134187 in words is "eighty-one million, one hundred thirty-four thousand, one hundred eighty-seven".