1225520143 has 4 divisors (see below), whose sum is σ = 1236365568. Its totient is φ = 1214674720.

The previous prime is 1225520129. The next prime is 1225520171. The reversal of 1225520143 is 3410255221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225520143 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 (1225520183) 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, 5422543 + ... + 5422768.

It is an arithmetic number, because the mean of its divisors is an integer number (309091392).

Almost surely, 2^1225520143 is an apocalyptic number.

1225520143 is a deficient number, since it is larger than the sum of its proper divisors (10845425).

1225520143 is a wasteful number, since it uses less digits than its factorization.

1225520143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10845424.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1225520143 is about 35007.4298256813. The cubic root of 1225520143 is about 1070.1389003598.

Adding to 1225520143 its reverse (3410255221), we get a palindrome (4635775364).

The spelling of 1225520143 in words is "one billion, two hundred twenty-five million, five hundred twenty thousand, one hundred forty-three".