1264215569 has 2 divisors, whose sum is σ = 1264215570. Its totient is φ = 1264215568.

The previous prime is 1264215527. The next prime is 1264215571. The reversal of 1264215569 is 9655124621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 809971600 + 454243969 = 28460^2 + 21313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264215569 is a prime.

It is a super-2 number, since 2×1264215569² = 3196482009803987522, which contains 22 as substring.

Together with 1264215571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1264235569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632107784 + 632107785.

It is an arithmetic number, because the mean of its divisors is an integer number (632107785).

Almost surely, 2^1264215569 is an apocalyptic number.

It is an amenable number.

1264215569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264215569 is an equidigital number, since it uses as much as digits as its factorization.

1264215569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 1264215569 is about 35555.8092159354. The cubic root of 1264215569 is about 1081.2854974747.

The spelling of 1264215569 in words is "one billion, two hundred sixty-four million, two hundred fifteen thousand, five hundred sixty-nine".