1264216247 has 4 divisors (see below), whose sum is σ = 1444818576. Its totient is φ = 1083613920.

The previous prime is 1264216241. The next prime is 1264216249. The reversal of 1264216247 is 7426124621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1264216247 - 2⁴ = 1264216231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264216241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90301154 + ... + 90301167.

It is an arithmetic number, because the mean of its divisors is an integer number (361204644).

Almost surely, 2^1264216247 is an apocalyptic number.

1264216247 is a deficient number, since it is larger than the sum of its proper divisors (180602329).

1264216247 is an equidigital number, since it uses as much as digits as its factorization.

1264216247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180602328.

The product of its digits is 32256, while the sum is 35.

The square root of 1264216247 is about 35555.8187502411. The cubic root of 1264216247 is about 1081.2856907728.

The spelling of 1264216247 in words is "one billion, two hundred sixty-four million, two hundred sixteen thousand, two hundred forty-seven".