81347907 has 8 divisors (see below), whose sum is σ = 114844176. Its totient is φ = 51041792.

The previous prime is 81347897. The next prime is 81347963. The reversal of 81347907 is 70974318.

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 81347907 - 2⁷ = 81347779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81347107) 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, 797478 + ... + 797579.

It is an arithmetic number, because the mean of its divisors is an integer number (14355522).

Almost surely, 2^81347907 is an apocalyptic number.

81347907 is a deficient number, since it is larger than the sum of its proper divisors (33496269).

81347907 is a wasteful number, since it uses less digits than its factorization.

81347907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595077.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 81347907 is about 9019.3074567840. The cubic root of 81347907 is about 433.2934538580.

The spelling of 81347907 in words is "eighty-one million, three hundred forty-seven thousand, nine hundred seven".