1225511043 has 16 divisors (see below), whose sum is σ = 1654876800. Its totient is φ = 806604480.

The previous prime is 1225511009. The next prime is 1225511059. The reversal of 1225511043 is 3401155221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1225511043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225511543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194208 + ... + 200418.

It is an arithmetic number, because the mean of its divisors is an integer number (103429800).

Almost surely, 2^1225511043 is an apocalyptic number.

1225511043 is a deficient number, since it is larger than the sum of its proper divisors (429365757).

1225511043 is an equidigital number, since it uses as much as digits as its factorization.

1225511043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7042.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1225511043 is about 35007.2998530307. The cubic root of 1225511043 is about 1070.1362516102.

Adding to 1225511043 its reverse (3401155221), we get a palindrome (4626666264).

The spelling of 1225511043 in words is "one billion, two hundred twenty-five million, five hundred eleven thousand, forty-three".