1264940321 has 2 divisors, whose sum is σ = 1264940322. Its totient is φ = 1264940320.

The previous prime is 1264940309. The next prime is 1264940351. The reversal of 1264940321 is 1230494621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243549696 + 21390625 = 35264^2 + 4625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264940321 - 2²² = 1260746017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264940351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632470160 + 632470161.

It is an arithmetic number, because the mean of its divisors is an integer number (632470161).

Almost surely, 2^1264940321 is an apocalyptic number.

It is an amenable number.

1264940321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264940321 is an equidigital number, since it uses as much as digits as its factorization.

1264940321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1264940321 is about 35565.9995079570. Note that the first 3 decimals coincide. The cubic root of 1264940321 is about 1081.4920851644.

The spelling of 1264940321 in words is "one billion, two hundred sixty-four million, nine hundred forty thousand, three hundred twenty-one".