81134737 has 8 divisors (see below), whose sum is σ = 82987776. Its totient is φ = 79287072.

The previous prime is 81134723. The next prime is 81134771. The reversal of 81134737 is 73743118.

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

It is a cyclic number.

It is not a de Polignac number, because 81134737 - 2²³ = 72746129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81134707) 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, 55348 + ... + 56794.

It is an arithmetic number, because the mean of its divisors is an integer number (10373472).

Almost surely, 2^81134737 is an apocalyptic number.

It is an amenable number.

81134737 is a deficient number, since it is larger than the sum of its proper divisors (1853039).

81134737 is a wasteful number, since it uses less digits than its factorization.

81134737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687.

The product of its digits is 14112, while the sum is 34.

The square root of 81134737 is about 9007.4822786392. The cubic root of 81134737 is about 432.9146448356.

The spelling of 81134737 in words is "eighty-one million, one hundred thirty-four thousand, seven hundred thirty-seven".