1260043261 has 4 divisors (see below), whose sum is σ = 1260799900. Its totient is φ = 1259286624.

The previous prime is 1260043231. The next prime is 1260043271. The reversal of 1260043261 is 1623400621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1623400621 = 719 ⋅2257859.

It can be written as a sum of positive squares in 2 ways, for example, as 523952100 + 736091161 = 22890^2 + 27131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1260043261 - 2²⁹ = 723172349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260043231) 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, 375816 + ... + 379153.

It is an arithmetic number, because the mean of its divisors is an integer number (315199975).

Almost surely, 2^1260043261 is an apocalyptic number.

It is an amenable number.

1260043261 is a deficient number, since it is larger than the sum of its proper divisors (756639).

1260043261 is an equidigital number, since it uses as much as digits as its factorization.

1260043261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756638.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1260043261 is about 35497.0880636708. The cubic root of 1260043261 is about 1080.0946593414.

Adding to 1260043261 its reverse (1623400621), we get a palindrome (2883443882).

The spelling of 1260043261 in words is "one billion, two hundred sixty million, forty-three thousand, two hundred sixty-one".