2545649 has 8 divisors (see below), whose sum is σ = 2698920. Its totient is φ = 2396800.

The previous prime is 2545633. The next prime is 2545651. The reversal of 2545649 is 9465452.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 399424 + 2146225 = 632^2 + 1465^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2545649 - 2⁴ = 2545633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119 + ... + 2259.

It is an arithmetic number, because the mean of its divisors is an integer number (337365).

2^2545649 is an apocalyptic number.

2545649 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2545649 is a deficient number, since it is larger than the sum of its proper divisors (153271).

2545649 is a wasteful number, since it uses less digits than its factorization.

2545649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211.

The product of its digits is 43200, while the sum is 35.

The square root of 2545649 is about 1595.5090096894. The cubic root of 2545649 is about 136.5419729859.

The spelling of 2545649 in words is "two million, five hundred forty-five thousand, six hundred forty-nine".