1263957641 has 2 divisors, whose sum is σ = 1263957642. Its totient is φ = 1263957640.

The previous prime is 1263957631. The next prime is 1263957647. The reversal of 1263957641 is 1467593621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673662025 + 590295616 = 25955^2 + 24296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263957641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1263957592 and 1263957601.

It is not a weakly prime, because it can be changed into another prime (1263957647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631978820 + 631978821.

It is an arithmetic number, because the mean of its divisors is an integer number (631978821).

Almost surely, 2^1263957641 is an apocalyptic number.

It is an amenable number.

1263957641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263957641 is an equidigital number, since it uses as much as digits as its factorization.

1263957641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 1263957641 is about 35552.1819442914. The cubic root of 1263957641 is about 1081.2119570697.

The spelling of 1263957641 in words is "one billion, two hundred sixty-three million, nine hundred fifty-seven thousand, six hundred forty-one".