2251437121 has 4 divisors (see below), whose sum is σ = 2260857600. Its totient is φ = 2242016644.

The previous prime is 2251437101. The next prime is 2251437131. The reversal of 2251437121 is 1217341522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1217341522 = 2 ⋅608670761.

It is a cyclic number.

It is not a de Polignac number, because 2251437121 - 2¹³ = 2251428929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2251437121.

It is not an unprimeable number, because it can be changed into a prime (2251437101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4709881 + ... + 4710358.

It is an arithmetic number, because the mean of its divisors is an integer number (565214400).

Almost surely, 2^2251437121 is an apocalyptic number.

It is an amenable number.

2251437121 is a deficient number, since it is larger than the sum of its proper divisors (9420479).

2251437121 is an equidigital number, since it uses as much as digits as its factorization.

2251437121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420478.

The product of its digits is 3360, while the sum is 28.

The square root of 2251437121 is about 47449.3110698143. The cubic root of 2251437121 is about 1310.6496245787.

Adding to 2251437121 its reverse (1217341522), we get a palindrome (3468778643).

The spelling of 2251437121 in words is "two billion, two hundred fifty-one million, four hundred thirty-seven thousand, one hundred twenty-one".