2209157 has 4 divisors (see below), whose sum is σ = 2212140. Its totient is φ = 2206176.

The previous prime is 2209117. The next prime is 2209169. The reversal of 2209157 is 7519022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2172676 + 36481 = 1474^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209157 - 2¹⁶ = 2143621 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209117) 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, 569 + ... + 2177.

It is an arithmetic number, because the mean of its divisors is an integer number (553035).

2^2209157 is an apocalyptic number.

It is an amenable number.

2209157 is a deficient number, since it is larger than the sum of its proper divisors (2983).

2209157 is a wasteful number, since it uses less digits than its factorization.

2209157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2209157 is about 1486.3233161059. The cubic root of 2209157 is about 130.2393421159.

The spelling of 2209157 in words is "two million, two hundred nine thousand, one hundred fifty-seven".