1263522013 has 4 divisors (see below), whose sum is σ = 1360716028. Its totient is φ = 1166328000.

The previous prime is 1263522011. The next prime is 1263522037. The reversal of 1263522013 is 3102253621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 136375684 + 1127146329 = 11678^2 + 33573^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263522013 - 2¹ = 1263522011 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 (1263522011) 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, 48596988 + ... + 48597013.

It is an arithmetic number, because the mean of its divisors is an integer number (340179007).

Almost surely, 2^1263522013 is an apocalyptic number.

1263522013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1263522013 is a deficient number, since it is larger than the sum of its proper divisors (97194015).

1263522013 is an equidigital number, since it uses as much as digits as its factorization.

1263522013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97194014.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1263522013 is about 35546.0548162521. The cubic root of 1263522013 is about 1081.0877281376.

Adding to 1263522013 its reverse (3102253621), we get a palindrome (4365775634).

The spelling of 1263522013 in words is "one billion, two hundred sixty-three million, five hundred twenty-two thousand, thirteen".