1263972553 has 4 divisors (see below), whose sum is σ = 1264272768. Its totient is φ = 1263672340.

The previous prime is 1263972533. The next prime is 1263972583. The reversal of 1263972553 is 3552793621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1263972553 - 2⁹ = 1263972041 is a prime.

It is a super-2 number, since 2×1263972553² = 3195253229474675618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263972533) 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, 143701 + ... + 152242.

It is an arithmetic number, because the mean of its divisors is an integer number (316068192).

Almost surely, 2^1263972553 is an apocalyptic number.

It is an amenable number.

1263972553 is a deficient number, since it is larger than the sum of its proper divisors (300215).

1263972553 is an equidigital number, since it uses as much as digits as its factorization.

1263972553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300214.

The product of its digits is 340200, while the sum is 43.

The square root of 1263972553 is about 35552.3916635717. The cubic root of 1263972553 is about 1081.2162090501.

The spelling of 1263972553 in words is "one billion, two hundred sixty-three million, nine hundred seventy-two thousand, five hundred fifty-three".