83691047 has 8 divisors (see below), whose sum is σ = 91552512. Its totient is φ = 75871800.

The previous prime is 83691019. The next prime is 83691109. The reversal of 83691047 is 74019638.

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 83691047 - 2¹⁰ = 83690023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83691047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83694047) 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, 6329 + ... + 14402.

It is an arithmetic number, because the mean of its divisors is an integer number (11444064).

Almost surely, 2^83691047 is an apocalyptic number.

83691047 is a deficient number, since it is larger than the sum of its proper divisors (7861465).

83691047 is a wasteful number, since it uses less digits than its factorization.

83691047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21109.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 83691047 is about 9148.2810953752. The cubic root of 83691047 is about 437.4143235767.

The spelling of 83691047 in words is "eighty-three million, six hundred ninety-one thousand, forty-seven".