2045621 has 4 divisors (see below), whose sum is σ = 2059500. Its totient is φ = 2031744.

The previous prime is 2045611. The next prime is 2045629. The reversal of 2045621 is 1265402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 1575025 = 686^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045621 - 2⁶ = 2045557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2045593 and 2045602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6716 + ... + 7013.

It is an arithmetic number, because the mean of its divisors is an integer number (514875).

2^2045621 is an apocalyptic number.

It is an amenable number.

2045621 is a deficient number, since it is larger than the sum of its proper divisors (13879).

2045621 is a wasteful number, since it uses less digits than its factorization.

2045621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13878.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2045621 is about 1430.2520756846. The cubic root of 2045621 is about 126.9428928774.

The spelling of 2045621 in words is "two million, forty-five thousand, six hundred twenty-one".