1263353251 has 4 divisors (see below), whose sum is σ = 1263428712. Its totient is φ = 1263277792.

The previous prime is 1263353243. The next prime is 1263353281. The reversal of 1263353251 is 1523533621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1263353251 - 2³ = 1263353243 is a prime.

It is a super-3 number, since 3×1263353251³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263353281) 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, 121 + ... + 50266.

It is an arithmetic number, because the mean of its divisors is an integer number (315857178).

Almost surely, 2^1263353251 is an apocalyptic number.

1263353251 is a deficient number, since it is larger than the sum of its proper divisors (75461).

1263353251 is an equidigital number, since it uses as much as digits as its factorization.

1263353251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75460.

The product of its digits is 16200, while the sum is 31.

The square root of 1263353251 is about 35543.6808870438. The cubic root of 1263353251 is about 1081.0395942576.

Adding to 1263353251 its reverse (1523533621), we get a palindrome (2786886872).

The spelling of 1263353251 in words is "one billion, two hundred sixty-three million, three hundred fifty-three thousand, two hundred fifty-one".