1264616849 has 2 divisors, whose sum is σ = 1264616850. Its totient is φ = 1264616848.

The previous prime is 1264616831. The next prime is 1264616861. The reversal of 1264616849 is 9486164621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827597824 + 437019025 = 28768^2 + 20905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264616849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1264616809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632308424 + 632308425.

It is an arithmetic number, because the mean of its divisors is an integer number (632308425).

Almost surely, 2^1264616849 is an apocalyptic number.

It is an amenable number.

1264616849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264616849 is an equidigital number, since it uses as much as digits as its factorization.

1264616849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 1264616849 is about 35561.4517279596. The cubic root of 1264616849 is about 1081.3998905035.

The spelling of 1264616849 in words is "one billion, two hundred sixty-four million, six hundred sixteen thousand, eight hundred forty-nine".