84151865 has 24 divisors (see below), whose sum is σ = 118713672. Its totient is φ = 57093120.

The previous prime is 84151861. The next prime is 84151889. The reversal of 84151865 is 56815148.

84151865 = 883² + 884² + ... + 979².

It can be written as a sum of positive squares in 4 ways, for example, as 5368489 + 78783376 = 2317^2 + 8876^2 .

It is not a de Polignac number, because 84151865 - 2² = 84151861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84151861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21995 + ... + 25535.

It is an arithmetic number, because the mean of its divisors is an integer number (4946403).

Almost surely, 2^84151865 is an apocalyptic number.

It is an amenable number.

84151865 is a deficient number, since it is larger than the sum of its proper divisors (34561807).

84151865 is a wasteful number, since it uses less digits than its factorization.

84151865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3650 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 84151865 is about 9173.4325636590. The cubic root of 84151865 is about 438.2156819506.

The spelling of 84151865 in words is "eighty-four million, one hundred fifty-one thousand, eight hundred sixty-five".