1263076981 has 2 divisors, whose sum is σ = 1263076982. Its totient is φ = 1263076980.

The previous prime is 1263076951. The next prime is 1263076987. The reversal of 1263076981 is 1896703621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1067328900 + 195748081 = 32670^2 + 13991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263076981 - 2⁷ = 1263076853 is a prime.

It is a super-2 number, since 2×1263076981² = 3190726919864148722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263076987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631538490 + 631538491.

It is an arithmetic number, because the mean of its divisors is an integer number (631538491).

Almost surely, 2^1263076981 is an apocalyptic number.

It is an amenable number.

1263076981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263076981 is an equidigital number, since it uses as much as digits as its factorization.

1263076981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1263076981 is about 35539.7943297369. The cubic root of 1263076981 is about 1080.9607879588.

The spelling of 1263076981 in words is "one billion, two hundred sixty-three million, seventy-six thousand, nine hundred eighty-one".