1261800875 has 16 divisors (see below), whose sum is σ = 1629033120. Its totient is φ = 974629600.

The previous prime is 1261800863. The next prime is 1261800913. The reversal of 1261800875 is 5780081621.

It is not a de Polignac number, because 1261800875 - 2⁸ = 1261800619 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 170417 + ... + 177666.

It is an arithmetic number, because the mean of its divisors is an integer number (101814570).

Almost surely, 2^1261800875 is an apocalyptic number.

1261800875 is a deficient number, since it is larger than the sum of its proper divisors (367232245).

1261800875 is an equidigital number, since it uses as much as digits as its factorization.

1261800875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348127 (or 348117 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 1261800875 is about 35521.8365938475. The cubic root of 1261800875 is about 1080.5966282180.

The spelling of 1261800875 in words is "one billion, two hundred sixty-one million, eight hundred thousand, eight hundred seventy-five".