84507121 has 4 divisors (see below), whose sum is σ = 84531172. Its totient is φ = 84483072.

The previous prime is 84507113. The next prime is 84507127. The reversal of 84507121 is 12170548.

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 30924721 + 53582400 = 5561^2 + 7320^2 .

It is a cyclic number.

It is not a de Polignac number, because 84507121 - 2³ = 84507113 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 84507121.

It is not an unprimeable number, because it can be changed into a prime (84507127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5616 + ... + 14161.

It is an arithmetic number, because the mean of its divisors is an integer number (21132793).

Almost surely, 2^84507121 is an apocalyptic number.

It is an amenable number.

84507121 is a deficient number, since it is larger than the sum of its proper divisors (24051).

84507121 is a wasteful number, since it uses less digits than its factorization.

84507121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24050.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 84507121 is about 9192.7754786027. The cubic root of 84507121 is about 438.8314741703.

Adding to 84507121 its reverse (12170548), we get a palindrome (96677669).

It can be divided in two parts, 8 and 4507121, that added together give a square (4507129 = 2123²).

The spelling of 84507121 in words is "eighty-four million, five hundred seven thousand, one hundred twenty-one".