1264542263 has 4 divisors (see below), whose sum is σ = 1338927120. Its totient is φ = 1190157408.

The previous prime is 1264542259. The next prime is 1264542269. The reversal of 1264542263 is 3622454621.

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 1264542263 - 2² = 1264542259 is a prime.

It is a super-2 number, since 2×1264542263² = 3198134269826322338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264542269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37192403 + ... + 37192436.

It is an arithmetic number, because the mean of its divisors is an integer number (334731780).

Almost surely, 2^1264542263 is an apocalyptic number.

1264542263 is a deficient number, since it is larger than the sum of its proper divisors (74384857).

1264542263 is an equidigital number, since it uses as much as digits as its factorization.

1264542263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74384856.

The product of its digits is 69120, while the sum is 35.

The square root of 1264542263 is about 35560.4030207758. The cubic root of 1264542263 is about 1081.3786300777.

Adding to 1264542263 its reverse (3622454621), we get a palindrome (4886996884).

The spelling of 1264542263 in words is "one billion, two hundred sixty-four million, five hundred forty-two thousand, two hundred sixty-three".