2451649 has 4 divisors (see below), whose sum is σ = 2456020. Its totient is φ = 2447280.

The previous prime is 2451643. The next prime is 2451667. The reversal of 2451649 is 9461542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9461542 = 2 ⋅4730771.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 1140624 = 1145^2 + 1068^2 .

It is a cyclic number.

It is not a de Polignac number, because 2451649 - 2³ = 2451641 is a prime.

It is a super-3 number, since 3×2451649³ = 44207518074333937347, which contains 333 as substring.

It is a Duffinian number.

2451649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2451649.

It is not an unprimeable number, because it can be changed into a prime (2451641) 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, 1194 + ... + 2515.

It is an arithmetic number, because the mean of its divisors is an integer number (614005).

2^2451649 is an apocalyptic number.

It is an amenable number.

2451649 is a deficient number, since it is larger than the sum of its proper divisors (4371).

2451649 is an equidigital number, since it uses as much as digits as its factorization.

2451649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370.

The product of its digits is 8640, while the sum is 31.

The square root of 2451649 is about 1565.7742493731. The cubic root of 2451649 is about 134.8402133280.

The spelling of 2451649 in words is "two million, four hundred fifty-one thousand, six hundred forty-nine".