2209669861 has 4 divisors (see below), whose sum is σ = 2525336992. Its totient is φ = 1894002732.

The previous prime is 2209669841. The next prime is 2209669873. The reversal of 2209669861 is 1689669022.

2209669861 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2209669861 - 2¹⁹ = 2209145573 is a prime.

It is a super-2 number, since 2×2209669861² = 9765281789223518642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209669811) 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, 157833555 + ... + 157833568.

It is an arithmetic number, because the mean of its divisors is an integer number (631334248).

Almost surely, 2^2209669861 is an apocalyptic number.

It is an amenable number.

2209669861 is a deficient number, since it is larger than the sum of its proper divisors (315667131).

2209669861 is an equidigital number, since it uses as much as digits as its factorization.

2209669861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315667130.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 2209669861 is about 47007.1256406941. The cubic root of 2209669861 is about 1302.4941979275.

The spelling of 2209669861 in words is "two billion, two hundred nine million, six hundred sixty-nine thousand, eight hundred sixty-one".