2251331361 has 24 divisors (see below), whose sum is σ = 3418707680. Its totient is φ = 1464251040.

The previous prime is 2251331353. The next prime is 2251331363. The reversal of 2251331361 is 1631331522.

It is not a de Polignac number, because 2251331361 - 2³ = 2251331353 is a prime.

It is a super-2 number, since 2×2251331361² = 10136985794044224642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251331363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20586 + ... + 70188.

Almost surely, 2^2251331361 is an apocalyptic number.

It is an amenable number.

2251331361 is a deficient number, since it is larger than the sum of its proper divisors (1167376319).

2251331361 is an equidigital number, since it uses as much as digits as its factorization.

2251331361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49694 (or 49647 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 2251331361 is about 47448.1966042968. The cubic root of 2251331361 is about 1310.6291019129.

Adding to 2251331361 its reverse (1631331522), we get a palindrome (3882662883).

The spelling of 2251331361 in words is "two billion, two hundred fifty-one million, three hundred thirty-one thousand, three hundred sixty-one".