2251181361 has 64 divisors (see below), whose sum is σ = 3779758080. Its totient is φ = 1170723840.

The previous prime is 2251181353. The next prime is 2251181369. The reversal of 2251181361 is 1631811522.

It is an interprime number because it is at equal distance from previous prime (2251181353) and next prime (2251181369).

It is not a de Polignac number, because 2251181361 - 2³ = 2251181353 is a prime.

It is a super-2 number, since 2×2251181361² = 10135635040227624642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2251181369) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 603460 + ... + 607178.

It is an arithmetic number, because the mean of its divisors is an integer number (59058720).

Almost surely, 2^2251181361 is an apocalyptic number.

It is an amenable number.

2251181361 is a deficient number, since it is larger than the sum of its proper divisors (1528576719).

2251181361 is a wasteful number, since it uses less digits than its factorization.

2251181361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846.

The product of its digits is 2880, while the sum is 30.

The square root of 2251181361 is about 47446.6159067219. The cubic root of 2251181361 is about 1310.5999933988.

Adding to 2251181361 its reverse (1631811522), we get a palindrome (3882992883).

The spelling of 2251181361 in words is "two billion, two hundred fifty-one million, one hundred eighty-one thousand, three hundred sixty-one".