2153640391 has 16 divisors (see below), whose sum is σ = 2472421888. Its totient is φ = 1837663200.

The previous prime is 2153640343. The next prime is 2153640413. The reversal of 2153640391 is 1930463512.

2153640391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2153640391 - 2⁷ = 2153640263 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 (2153640341) 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, 2616406 + ... + 2617228.

It is an arithmetic number, because the mean of its divisors is an integer number (154526368).

Almost surely, 2^2153640391 is an apocalyptic number.

2153640391 is a deficient number, since it is larger than the sum of its proper divisors (318781497).

2153640391 is an equidigital number, since it uses as much as digits as its factorization.

2153640391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 2153640391 is about 46407.3312204009. The cubic root of 2153640391 is about 1291.3909222516.

The spelling of 2153640391 in words is "two billion, one hundred fifty-three million, six hundred forty thousand, three hundred ninety-one".