1262928661 has 2 divisors, whose sum is σ = 1262928662. Its totient is φ = 1262928660.

The previous prime is 1262928647. The next prime is 1262928677. The reversal of 1262928661 is 1668292621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869660100 + 393268561 = 29490^2 + 19831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1262928661 - 2²⁵ = 1229374229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1262928631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631464330 + 631464331.

It is an arithmetic number, because the mean of its divisors is an integer number (631464331).

Almost surely, 2^1262928661 is an apocalyptic number.

It is an amenable number.

1262928661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262928661 is an equidigital number, since it uses as much as digits as its factorization.

1262928661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 1262928661 is about 35537.7075934844. The cubic root of 1262928661 is about 1080.9184747869.

The spelling of 1262928661 in words is "one billion, two hundred sixty-two million, nine hundred twenty-eight thousand, six hundred sixty-one".