1263902641 has 2 divisors, whose sum is σ = 1263902642. Its totient is φ = 1263902640.

The previous prime is 1263902611. The next prime is 1263902659. The reversal of 1263902641 is 1462093621.

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., 1135420416 + 128482225 = 33696^2 + 11335^2 .

It is an emirp because it is prime and its reverse (1462093621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263902641 - 2⁷ = 1263902513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263902597 and 1263902606.

It is not a weakly prime, because it can be changed into another prime (1263902611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631951320 + 631951321.

It is an arithmetic number, because the mean of its divisors is an integer number (631951321).

Almost surely, 2^1263902641 is an apocalyptic number.

It is an amenable number.

1263902641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263902641 is an equidigital number, since it uses as much as digits as its factorization.

1263902641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1263902641 is about 35551.4084249837. The cubic root of 1263902641 is about 1081.1962741813.

The spelling of 1263902641 in words is "one billion, two hundred sixty-three million, nine hundred two thousand, six hundred forty-one".