1264648349 has 2 divisors, whose sum is σ = 1264648350. Its totient is φ = 1264648348.

The previous prime is 1264648291. The next prime is 1264648351. The reversal of 1264648349 is 9438464621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1264300249 + 348100 = 35557^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264648349 - 2²⁴ = 1247871133 is a prime.

Together with 1264648351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264648369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632324174 + 632324175.

It is an arithmetic number, because the mean of its divisors is an integer number (632324175).

Almost surely, 2^1264648349 is an apocalyptic number.

It is an amenable number.

1264648349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264648349 is an equidigital number, since it uses as much as digits as its factorization.

1264648349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 47.

The square root of 1264648349 is about 35561.8946205064. The cubic root of 1264648349 is about 1081.4088691950.

The spelling of 1264648349 in words is "one billion, two hundred sixty-four million, six hundred forty-eight thousand, three hundred forty-nine".