1261449568 has 48 divisors (see below), whose sum is σ = 2513016576. Its totient is φ = 623272960.

The previous prime is 1261449503. The next prime is 1261449571. The reversal of 1261449568 is 8659441621.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056780 + ... + 1057972.

It is an arithmetic number, because the mean of its divisors is an integer number (52354512).

Almost surely, 2^1261449568 is an apocalyptic number.

It is an amenable number.

1261449568 is a deficient number, since it is larger than the sum of its proper divisors (1251567008).

1261449568 is a wasteful number, since it uses less digits than its factorization.

1261449568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567 (or 1559 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 1261449568 is about 35516.8913054057. The cubic root of 1261449568 is about 1080.4963333659.

The spelling of 1261449568 in words is "one billion, two hundred sixty-one million, four hundred forty-nine thousand, five hundred sixty-eight".