1261544260 has 48 divisors (see below), whose sum is σ = 2676870000. Its totient is φ = 499382784.

The previous prime is 1261544243. The next prime is 1261544299. The reversal of 1261544260 is 624451621.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 246866944 + 1014677316 = 15712^2 + 31854^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039414 + ... + 1040626.

It is an arithmetic number, because the mean of its divisors is an integer number (55768125).

Almost surely, 2^1261544260 is an apocalyptic number.

1261544260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261544260 is an abundant number, since it is smaller than the sum of its proper divisors (1415325740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261544260 is a wasteful number, since it uses less digits than its factorization.

1261544260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1261544260 is about 35518.2243362474. The cubic root of 1261544260 is about 1080.5233688763.

Adding to 1261544260 its reverse (624451621), we get a palindrome (1885995881).

The spelling of 1261544260 in words is "one billion, two hundred sixty-one million, five hundred forty-four thousand, two hundred sixty".