1260801691 has 2 divisors, whose sum is σ = 1260801692. Its totient is φ = 1260801690.

The previous prime is 1260801611. The next prime is 1260801697. The reversal of 1260801691 is 1961080621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1961080621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1260801691 - 2²³ = 1252413083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1260801697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630400845 + 630400846.

It is an arithmetic number, because the mean of its divisors is an integer number (630400846).

Almost surely, 2^1260801691 is an apocalyptic number.

1260801691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260801691 is an equidigital number, since it uses as much as digits as its factorization.

1260801691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1260801691 is about 35507.7694455735. The cubic root of 1260801691 is about 1080.3113217150.

The spelling of 1260801691 in words is "one billion, two hundred sixty million, eight hundred one thousand, six hundred ninety-one".