2131569 has 16 divisors (see below), whose sum is σ = 3445440. Its totient is φ = 1291680.

The previous prime is 2131567. The next prime is 2131573. The reversal of 2131569 is 9651312.

It is not a de Polignac number, because 2131569 - 2¹ = 2131567 is a prime.

It is a super-2 number, since 2×2131569² = 9087172803522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2131567) 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, 3292 + ... + 3885.

It is an arithmetic number, because the mean of its divisors is an integer number (215340).

2^2131569 is an apocalyptic number.

It is an amenable number.

2131569 is a deficient number, since it is larger than the sum of its proper divisors (1313871).

2131569 is a wasteful number, since it uses less digits than its factorization.

2131569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197 (or 7191 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2131569 is about 1459.9893835230. The cubic root of 2131569 is about 128.6964197199.

The spelling of 2131569 in words is "two million, one hundred thirty-one thousand, five hundred sixty-nine".