84131765 has 4 divisors (see below), whose sum is σ = 100958124. Its totient is φ = 67305408.

The previous prime is 84131743. The next prime is 84131783. The reversal of 84131765 is 56713148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57896881 + 26234884 = 7609^2 + 5122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84131765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8413172 + ... + 8413181.

It is an arithmetic number, because the mean of its divisors is an integer number (25239531).

Almost surely, 2^84131765 is an apocalyptic number.

It is an amenable number.

84131765 is a deficient number, since it is larger than the sum of its proper divisors (16826359).

84131765 is a wasteful number, since it uses less digits than its factorization.

84131765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16826358.

The product of its digits is 20160, while the sum is 35.

The square root of 84131765 is about 9172.3369432223. The cubic root of 84131765 is about 438.1807893328.

The spelling of 84131765 in words is "eighty-four million, one hundred thirty-one thousand, seven hundred sixty-five".