1263790901 has 2 divisors, whose sum is σ = 1263790902. Its totient is φ = 1263790900.

The previous prime is 1263790889. The next prime is 1263790903. The reversal of 1263790901 is 1090973621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1015696900 + 248094001 = 31870^2 + 15751^2 .

It is an emirp because it is prime and its reverse (1090973621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263790901 is a prime.

Together with 1263790903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263790903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631895450 + 631895451.

It is an arithmetic number, because the mean of its divisors is an integer number (631895451).

Almost surely, 2^1263790901 is an apocalyptic number.

It is an amenable number.

1263790901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263790901 is an equidigital number, since it uses as much as digits as its factorization.

1263790901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1263790901 is about 35549.8368631981. The cubic root of 1263790901 is about 1081.1644108535.

The spelling of 1263790901 in words is "one billion, two hundred sixty-three million, seven hundred ninety thousand, nine hundred one".