1264345421 has 2 divisors, whose sum is σ = 1264345422. Its totient is φ = 1264345420.

The previous prime is 1264345387. The next prime is 1264345441. The reversal of 1264345421 is 1245434621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1098193321 + 166152100 = 33139^2 + 12890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264345421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264345441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632172710 + 632172711.

It is an arithmetic number, because the mean of its divisors is an integer number (632172711).

Almost surely, 2^1264345421 is an apocalyptic number.

It is an amenable number.

1264345421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264345421 is an equidigital number, since it uses as much as digits as its factorization.

1264345421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 32.

The square root of 1264345421 is about 35557.6351997711. The cubic root of 1264345421 is about 1081.3225170783.

The spelling of 1264345421 in words is "one billion, two hundred sixty-four million, three hundred forty-five thousand, four hundred twenty-one".