2689450921 has 4 divisors (see below), whose sum is σ = 2740195332. Its totient is φ = 2638706512.

The previous prime is 2689450901. The next prime is 2689450991. The reversal of 2689450921 is 1290549862.

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 2216997225 + 472453696 = 47085^2 + 21736^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689450921 - 2¹¹ = 2689448873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2689450901) 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, 25372126 + ... + 25372231.

It is an arithmetic number, because the mean of its divisors is an integer number (685048833).

Almost surely, 2^2689450921 is an apocalyptic number.

It is an amenable number.

2689450921 is a deficient number, since it is larger than the sum of its proper divisors (50744411).

2689450921 is an equidigital number, since it uses as much as digits as its factorization.

2689450921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50744410.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 2689450921 is about 51859.9163227246. The cubic root of 2689450921 is about 1390.6607835936.

It can be divided in two parts, 26894 and 50921, that added together give a triangular number (77815 = T₃₉₄).

The spelling of 2689450921 in words is "two billion, six hundred eighty-nine million, four hundred fifty thousand, nine hundred twenty-one".