1225644311 has 4 divisors (see below), whose sum is σ = 1225731000. Its totient is φ = 1225557624.

The previous prime is 1225644307. The next prime is 1225644323. The reversal of 1225644311 is 1134465221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1225644311 - 2² = 1225644307 is a prime.

It is a super-4 number, since 4×1225644311⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225646311) 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, 16661 + ... + 52238.

It is an arithmetic number, because the mean of its divisors is an integer number (306432750).

Almost surely, 2^1225644311 is an apocalyptic number.

1225644311 is a deficient number, since it is larger than the sum of its proper divisors (86689).

1225644311 is an equidigital number, since it uses as much as digits as its factorization.

1225644311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86688.

The product of its digits is 5760, while the sum is 29.

The square root of 1225644311 is about 35009.2032328644. The cubic root of 1225644311 is about 1070.1750408020.

The spelling of 1225644311 in words is "one billion, two hundred twenty-five million, six hundred forty-four thousand, three hundred eleven".