1269316813 has 2 divisors, whose sum is σ = 1269316814. Its totient is φ = 1269316812.

The previous prime is 1269316777. The next prime is 1269316817. The reversal of 1269316813 is 3186139621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267502404 + 1814409 = 35602^2 + 1347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1269316813 - 2¹⁷ = 1269185741 is a prime.

It is a super-2 number, since 2×1269316813² = 3222330343528953938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1269316817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634658406 + 634658407.

It is an arithmetic number, because the mean of its divisors is an integer number (634658407).

Almost surely, 2^1269316813 is an apocalyptic number.

It is an amenable number.

1269316813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269316813 is an equidigital number, since it uses as much as digits as its factorization.

1269316813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 1269316813 is about 35627.4727282192. The cubic root of 1269316813 is about 1082.7379129214.

It can be divided in two parts, 1269316 and 813, that added together give a square (1270129 = 1127²).

The spelling of 1269316813 in words is "one billion, two hundred sixty-nine million, three hundred sixteen thousand, eight hundred thirteen".