1261445044 has 12 divisors (see below), whose sum is σ = 2212630084. Its totient is φ = 629265024.

The previous prime is 1261445027. The next prime is 1261445057. The reversal of 1261445044 is 4405441621.

It can be written as a sum of positive squares in 2 ways, for example, as 576576144 + 684868900 = 24012^2 + 26170^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1261444997 and 1261445015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362427 + ... + 365890.

Almost surely, 2^1261445044 is an apocalyptic number.

It is an amenable number.

1261445044 is a deficient number, since it is larger than the sum of its proper divisors (951185040).

1261445044 is a wasteful number, since it uses less digits than its factorization.

1261445044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728754 (or 728752 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1261445044 is about 35516.8276173422. The cubic root of 1261445044 is about 1080.4950416849.

Adding to 1261445044 its reverse (4405441621), we get a palindrome (5666886665).

The spelling of 1261445044 in words is "one billion, two hundred sixty-one million, four hundred forty-five thousand, forty-four".