2161429 has 4 divisors (see below), whose sum is σ = 2219884. Its totient is φ = 2102976.

The previous prime is 2161427. The next prime is 2161433. The reversal of 2161429 is 9241612.

2161429 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 can be written as a sum of positive squares in 2 ways, for example, as 1954404 + 207025 = 1398^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161429 - 2¹ = 2161427 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 (2161427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29172 + ... + 29245.

It is an arithmetic number, because the mean of its divisors is an integer number (554971).

2^2161429 is an apocalyptic number.

It is an amenable number.

2161429 is a deficient number, since it is larger than the sum of its proper divisors (58455).

2161429 is an equidigital number, since it uses as much as digits as its factorization.

2161429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58454.

The product of its digits is 864, while the sum is 25.

The square root of 2161429 is about 1470.1799209621. The cubic root of 2161429 is about 129.2945814806.

The spelling of 2161429 in words is "two million, one hundred sixty-one thousand, four hundred twenty-nine".