2170900391 has 16 divisors (see below), whose sum is σ = 2548685088. Its totient is φ = 1826995200.

The previous prime is 2170900373. The next prime is 2170900447. The reversal of 2170900391 is 1930090712.

It is a happy number.

2170900391 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 2170900391 - 2⁶ = 2170900327 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 (2170900321) 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, 83750 + ... + 106563.

It is an arithmetic number, because the mean of its divisors is an integer number (159292818).

Almost surely, 2^2170900391 is an apocalyptic number.

2170900391 is a deficient number, since it is larger than the sum of its proper divisors (377784697).

2170900391 is a wasteful number, since it uses less digits than its factorization.

2170900391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190402.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 2170900391 is about 46592.9221126986. The cubic root of 2170900391 is about 1294.8316276080.

The spelling of 2170900391 in words is "two billion, one hundred seventy million, nine hundred thousand, three hundred ninety-one".