81133707 has 8 divisors (see below), whose sum is σ = 114541776. Its totient is φ = 50907392.

The previous prime is 81133697. The next prime is 81133747. The reversal of 81133707 is 70733118.

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 81133707 - 2⁶ = 81133643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81133747) 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, 795378 + ... + 795479.

It is an arithmetic number, because the mean of its divisors is an integer number (14317722).

Almost surely, 2^81133707 is an apocalyptic number.

81133707 is a deficient number, since it is larger than the sum of its proper divisors (33408069).

81133707 is a wasteful number, since it uses less digits than its factorization.

81133707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590877.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 81133707 is about 9007.4251037686. The cubic root of 81133707 is about 432.9128128871.

The spelling of 81133707 in words is "eighty-one million, one hundred thirty-three thousand, seven hundred seven".