2255721031 has 4 divisors (see below), whose sum is σ = 2266411864. Its totient is φ = 2245030200.

The previous prime is 2255720923. The next prime is 2255721053. The reversal of 2255721031 is 1301275522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2255721031 - 2³¹ = 108237383 is a prime.

It is a super-2 number, since 2×2255721031² = 10176554739391405922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2255721331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5345100 + ... + 5345521.

It is an arithmetic number, because the mean of its divisors is an integer number (566602966).

Almost surely, 2^2255721031 is an apocalyptic number.

2255721031 is a deficient number, since it is larger than the sum of its proper divisors (10690833).

2255721031 is a wasteful number, since it uses less digits than its factorization.

2255721031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10690832.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 2255721031 is about 47494.4315788704. The cubic root of 2255721031 is about 1311.4803750985.

Adding to 2255721031 its reverse (1301275522), we get a palindrome (3556996553).

The spelling of 2255721031 in words is "two billion, two hundred fifty-five million, seven hundred twenty-one thousand, thirty-one".