2251211405 has 32 divisors (see below), whose sum is σ = 2834818560. Its totient is φ = 1714821120.

The previous prime is 2251211401. The next prime is 2251211423. The reversal of 2251211405 is 5041121522.

It is not a de Polignac number, because 2251211405 - 2² = 2251211401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251211401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1389686 + ... + 1391304.

It is an arithmetic number, because the mean of its divisors is an integer number (88588080).

Almost surely, 2^2251211405 is an apocalyptic number.

It is an amenable number.

2251211405 is a deficient number, since it is larger than the sum of its proper divisors (583607155).

2251211405 is a wasteful number, since it uses less digits than its factorization.

2251211405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2251211405 is about 47446.9325141257. The cubic root of 2251211405 is about 1310.6058237437.

Adding to 2251211405 its reverse (5041121522), we get a palindrome (7292332927).

The spelling of 2251211405 in words is "two billion, two hundred fifty-one million, two hundred eleven thousand, four hundred five".