1255620211 has 4 divisors (see below), whose sum is σ = 1255695712. Its totient is φ = 1255544712.

The previous prime is 1255620193. The next prime is 1255620229. The reversal of 1255620211 is 1120265521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1120265521 = 839 ⋅1335239.

It is an interprime number because it is at equal distance from previous prime (1255620193) and next prime (1255620229).

It is a cyclic number.

It is not a de Polignac number, because 1255620211 - 2⁷ = 1255620083 is a prime.

It is a super-2 number, since 2×1255620211² = 3153164228543369042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255620251) 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, 651 + ... + 50116.

It is an arithmetic number, because the mean of its divisors is an integer number (313923928).

Almost surely, 2^1255620211 is an apocalyptic number.

1255620211 is a deficient number, since it is larger than the sum of its proper divisors (75501).

1255620211 is an equidigital number, since it uses as much as digits as its factorization.

1255620211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75500.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1255620211 is about 35434.7317049248. The cubic root of 1255620211 is about 1078.8293817672.

Adding to 1255620211 its reverse (1120265521), we get a palindrome (2375885732).

The spelling of 1255620211 in words is "one billion, two hundred fifty-five million, six hundred twenty thousand, two hundred eleven".