1264005251 has 2 divisors, whose sum is σ = 1264005252. Its totient is φ = 1264005250.

The previous prime is 1264005247. The next prime is 1264005269. The reversal of 1264005251 is 1525004621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1264005251 - 2² = 1264005247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1264005251.

It is not a weakly prime, because it can be changed into another prime (1264005221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632002625 + 632002626.

It is an arithmetic number, because the mean of its divisors is an integer number (632002626).

Almost surely, 2^1264005251 is an apocalyptic number.

1264005251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264005251 is an equidigital number, since it uses as much as digits as its factorization.

1264005251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1264005251 is about 35552.8515171428. The cubic root of 1264005251 is about 1081.2255323809.

Adding to 1264005251 its reverse (1525004621), we get a palindrome (2789009872).

The spelling of 1264005251 in words is "one billion, two hundred sixty-four million, five thousand, two hundred fifty-one".