2391894649 has 3 divisors (see below), whose sum is σ = 2391943557. Its totient is φ = 2391845742.

The previous prime is 2391894623. The next prime is 2391894677. The reversal of 2391894649 is 9464981932.

The square root of 2391894649 is 48907.

It is a perfect power (a square), and thus also a powerful number.

2391894649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2391894649 - 2⁷ = 2391894521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2391894649.

It is not an unprimeable number, because it can be changed into a prime (2391894619) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 24454 + ... + 73360.

It is an arithmetic number, because the mean of its divisors is an integer number (797314519).

Almost surely, 2^2391894649 is an apocalyptic number.

2391894649 is the 48907-th square number.

2391894649 is the 24454-th centered octagonal number.

It is an amenable number.

2391894649 is a deficient number, since it is larger than the sum of its proper divisors (48908).

2391894649 is an frugal number, since it uses more digits than its factorization.

2391894649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97814 (or 48907 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The cubic root of 2391894649 is about 1337.3569810565.

The spelling of 2391894649 in words is "two billion, three hundred ninety-one million, eight hundred ninety-four thousand, six hundred forty-nine".