2251645 has 8 divisors (see below), whose sum is σ = 2947680. Its totient is φ = 1637520.

The previous prime is 2251643. The next prime is 2251649. The reversal of 2251645 is 5461522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2251645 - 2¹ = 2251643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20415 + ... + 20524.

It is an arithmetic number, because the mean of its divisors is an integer number (368460).

2^2251645 is an apocalyptic number.

It is an amenable number.

2251645 is a deficient number, since it is larger than the sum of its proper divisors (696035).

2251645 is a wasteful number, since it uses less digits than its factorization.

2251645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40955.

The product of its digits is 2400, while the sum is 25.

The square root of 2251645 is about 1500.5482331468. The cubic root of 2251645 is about 131.0689961503.

The spelling of 2251645 in words is "two million, two hundred fifty-one thousand, six hundred forty-five".