1263925851 has 4 divisors (see below), whose sum is σ = 1685234472. Its totient is φ = 842617232.

The previous prime is 1263925849. The next prime is 1263925889. The reversal of 1263925851 is 1585293621.

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 1263925851 - 2¹ = 1263925849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263925801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210654306 + ... + 210654311.

It is an arithmetic number, because the mean of its divisors is an integer number (421308618).

Almost surely, 2^1263925851 is an apocalyptic number.

1263925851 is a deficient number, since it is larger than the sum of its proper divisors (421308621).

1263925851 is an equidigital number, since it uses as much as digits as its factorization.

1263925851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421308620.

The product of its digits is 129600, while the sum is 42.

The square root of 1263925851 is about 35551.7348521841. The cubic root of 1263925851 is about 1081.2028924157.

The spelling of 1263925851 in words is "one billion, two hundred sixty-three million, nine hundred twenty-five thousand, eight hundred fifty-one".