1381221255 has 8 divisors (see below), whose sum is σ = 2209954032. Its totient is φ = 736651328.

The previous prime is 1381221241. The next prime is 1381221263. The reversal of 1381221255 is 5521221831.

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

It is a cyclic number.

It is not a de Polignac number, because 1381221255 - 2⁴ = 1381221239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46040694 + ... + 46040723.

It is an arithmetic number, because the mean of its divisors is an integer number (276244254).

Almost surely, 2^1381221255 is an apocalyptic number.

1381221255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1381221255 is a deficient number, since it is larger than the sum of its proper divisors (828732777).

1381221255 is an equidigital number, since it uses as much as digits as its factorization.

1381221255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92081425.

The product of its digits is 4800, while the sum is 30.

The square root of 1381221255 is about 37164.7851466950. The cubic root of 1381221255 is about 1113.6646067892.

The spelling of 1381221255 in words is "one billion, three hundred eighty-one million, two hundred twenty-one thousand, two hundred fifty-five".