1264390993 has 2 divisors, whose sum is σ = 1264390994. Its totient is φ = 1264390992.

The previous prime is 1264390991. The next prime is 1264390999. The reversal of 1264390993 is 3990934621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1244113984 + 20277009 = 35272^2 + 4503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264390993 - 2¹ = 1264390991 is a prime.

Together with 1264390991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1264390991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632195496 + 632195497.

It is an arithmetic number, because the mean of its divisors is an integer number (632195497).

Almost surely, 2^1264390993 is an apocalyptic number.

It is an amenable number.

1264390993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264390993 is an equidigital number, since it uses as much as digits as its factorization.

1264390993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 1264390993 is about 35558.2760127653. The cubic root of 1264390993 is about 1081.3355086329.

The spelling of 1264390993 in words is "one billion, two hundred sixty-four million, three hundred ninety thousand, nine hundred ninety-three".