1971255 has 32 divisors (see below), whose sum is σ = 3709440. Its totient is φ = 881280.

The previous prime is 1971253. The next prime is 1971289. The reversal of 1971255 is 5521791.

It is not a de Polignac number, because 1971255 - 2¹ = 1971253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1686 + ... + 2604.

It is an arithmetic number, because the mean of its divisors is an integer number (115920).

2^1971255 is an apocalyptic number.

1971255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1971255 is a deficient number, since it is larger than the sum of its proper divisors (1738185).

1971255 is a wasteful number, since it uses less digits than its factorization.

1971255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951.

The product of its digits is 3150, while the sum is 30.

The square root of 1971255 is about 1404.0138888202. The cubic root of 1971255 is about 125.3855827181.

The spelling of 1971255 in words is "one million, nine hundred seventy-one thousand, two hundred fifty-five".