1264397917 has 2 divisors, whose sum is σ = 1264397918. Its totient is φ = 1264397916.

The previous prime is 1264397909. The next prime is 1264397947. The reversal of 1264397917 is 7197934621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260179001 + 4218916 = 35499^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264397917 - 2³ = 1264397909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264397947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632198958 + 632198959.

It is an arithmetic number, because the mean of its divisors is an integer number (632198959).

Almost surely, 2^1264397917 is an apocalyptic number.

It is an amenable number.

1264397917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264397917 is an equidigital number, since it uses as much as digits as its factorization.

1264397917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 1264397917 is about 35558.3733739326. The cubic root of 1264397917 is about 1081.3374824826.

The spelling of 1264397917 in words is "one billion, two hundred sixty-four million, three hundred ninety-seven thousand, nine hundred seventeen".