2251901 has 2 divisors, whose sum is σ = 2251902. Its totient is φ = 2251900.

The previous prime is 2251897. The next prime is 2251903. The reversal of 2251901 is 1091522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2247001 + 4900 = 1499^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251901 - 2² = 2251897 is a prime.

It is a super-2 number, since 2×2251901² = 10142116227602, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 2251903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2251903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125950 + 1125951.

It is an arithmetic number, because the mean of its divisors is an integer number (1125951).

2^2251901 is an apocalyptic number.

It is an amenable number.

2251901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251901 is an equidigital number, since it uses as much as digits as its factorization.

2251901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 2251901 is about 1500.6335328787. The cubic root of 2251901 is about 131.0739632435.

The spelling of 2251901 in words is "two million, two hundred fifty-one thousand, nine hundred one".