1261255163 has 8 divisors (see below), whose sum is σ = 1504105728. Its totient is φ = 1034072424.

The previous prime is 1261255157. The next prime is 1261255187. The reversal of 1261255163 is 3615521621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261255163 - 2¹⁴ = 1261238779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261255103) 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 7 ways as a sum of consecutive naturals, for example, 3916781 + ... + 3917102.

It is an arithmetic number, because the mean of its divisors is an integer number (188013216).

Almost surely, 2^1261255163 is an apocalyptic number.

1261255163 is a deficient number, since it is larger than the sum of its proper divisors (242850565).

1261255163 is an equidigital number, since it uses as much as digits as its factorization.

1261255163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833913.

The product of its digits is 10800, while the sum is 32.

The square root of 1261255163 is about 35514.1544035614. The cubic root of 1261255163 is about 1080.4408245591.

Adding to 1261255163 its reverse (3615521621), we get a palindrome (4876776784).

The spelling of 1261255163 in words is "one billion, two hundred sixty-one million, two hundred fifty-five thousand, one hundred sixty-three".