2451621 has 16 divisors (see below), whose sum is σ = 3530304. Its totient is φ = 1507584.

The previous prime is 2451619. The next prime is 2451637. The reversal of 2451621 is 1261542.

It is not a de Polignac number, because 2451621 - 2¹ = 2451619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2451601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2250 + ... + 3156.

It is an arithmetic number, because the mean of its divisors is an integer number (220644).

2^2451621 is an apocalyptic number.

It is an amenable number.

2451621 is a deficient number, since it is larger than the sum of its proper divisors (1078683).

2451621 is a wasteful number, since it uses less digits than its factorization.

2451621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 480, while the sum is 21.

The square root of 2451621 is about 1565.7653080842. The cubic root of 2451621 is about 134.8396999945.

The spelling of 2451621 in words is "two million, four hundred fifty-one thousand, six hundred twenty-one".