1225213144 has 8 divisors (see below), whose sum is σ = 2297274660. Its totient is φ = 612606568.

The previous prime is 1225213139. The next prime is 1225213159. The reversal of 1225213144 is 4413125221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1225213144² = 3002294496460729472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76575814 + ... + 76575829.

Almost surely, 2^1225213144 is an apocalyptic number.

It is an amenable number.

1225213144 is a deficient number, since it is larger than the sum of its proper divisors (1072061516).

1225213144 is a wasteful number, since it uses less digits than its factorization.

1225213144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153151649 (or 153151645 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 1225213144 is about 35003.0447818472. The cubic root of 1225213144 is about 1070.0495344931.

Adding to 1225213144 its reverse (4413125221), we get a palindrome (5638338365).

It can be divided in two parts, 1225 and 213144, that added together give a square (214369 = 463²).

The spelling of 1225213144 in words is "one billion, two hundred twenty-five million, two hundred thirteen thousand, one hundred forty-four".