1263142523 has 4 divisors (see below), whose sum is σ = 1303889088. Its totient is φ = 1222395960.

The previous prime is 1263142513. The next prime is 1263142537. The reversal of 1263142523 is 3252413621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3252413621 = 6269 ⋅518809.

It is a cyclic number.

It is not a de Polignac number, because 1263142523 - 2¹⁶ = 1263076987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263142513) 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, 20373236 + ... + 20373297.

It is an arithmetic number, because the mean of its divisors is an integer number (325972272).

Almost surely, 2^1263142523 is an apocalyptic number.

1263142523 is a deficient number, since it is larger than the sum of its proper divisors (40746565).

1263142523 is an equidigital number, since it uses as much as digits as its factorization.

1263142523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40746564.

The product of its digits is 8640, while the sum is 29.

The square root of 1263142523 is about 35540.7164108998. The cubic root of 1263142523 is about 1080.9794849207.

The spelling of 1263142523 in words is "one billion, two hundred sixty-three million, one hundred forty-two thousand, five hundred twenty-three".