2164220431 has 4 divisors (see below), whose sum is σ = 2164434712. Its totient is φ = 2164006152.

The previous prime is 2164220423. The next prime is 2164220467. The reversal of 2164220431 is 1340224612.

It is a happy number.

2164220431 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.

It is a cyclic number.

It is not a de Polignac number, because 2164220431 - 2³ = 2164220423 is a prime.

It is a super-2 number, since 2×2164220431² = 9367700147915651522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2164220396 and 2164220405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164220231) 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, 91200 + ... + 112453.

It is an arithmetic number, because the mean of its divisors is an integer number (541108678).

Almost surely, 2^2164220431 is an apocalyptic number.

2164220431 is a deficient number, since it is larger than the sum of its proper divisors (214281).

2164220431 is a wasteful number, since it uses less digits than its factorization.

2164220431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214280.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 2164220431 is about 46521.1826053466. The cubic root of 2164220431 is about 1293.5021776603.

The spelling of 2164220431 in words is "two billion, one hundred sixty-four million, two hundred twenty thousand, four hundred thirty-one".