1224520853 has 4 divisors (see below), whose sum is σ = 1266745740. Its totient is φ = 1182295968.

The previous prime is 1224520799. The next prime is 1224520859. The reversal of 1224520853 is 3580254221.

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 825240529 + 399280324 = 28727^2 + 19982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224520853 - 2²⁴ = 1207743637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224520859) 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, 21112400 + ... + 21112457.

It is an arithmetic number, because the mean of its divisors is an integer number (316686435).

Almost surely, 2^1224520853 is an apocalyptic number.

It is an amenable number.

1224520853 is a deficient number, since it is larger than the sum of its proper divisors (42224887).

1224520853 is an equidigital number, since it uses as much as digits as its factorization.

1224520853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42224886.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 1224520853 is about 34993.1543733914. The cubic root of 1224520853 is about 1069.8479572591.

The spelling of 1224520853 in words is "one billion, two hundred twenty-four million, five hundred twenty thousand, eight hundred fifty-three".