2131669 has 2 divisors, whose sum is σ = 2131670. Its totient is φ = 2131668.

The previous prime is 2131651. The next prime is 2131687. The reversal of 2131669 is 9661312.

It is a balanced prime because it is at equal distance from previous prime (2131651) and next prime (2131687).

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 213444 = 1385^2 + 462^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131669 - 2⁷ = 2131541 is a prime.

It is a super-2 number, since 2×2131669² = 9088025451122, which contains 22 as substring.

It is a Chen prime.

2131669 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065834 + 1065835.

It is an arithmetic number, because the mean of its divisors is an integer number (1065835).

2^2131669 is an apocalyptic number.

It is an amenable number.

2131669 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131669 is an equidigital number, since it uses as much as digits as its factorization.

2131669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 2131669 is about 1460.0236299458. The cubic root of 2131669 is about 128.6984322344.

The spelling of 2131669 in words is "two million, one hundred thirty-one thousand, six hundred sixty-nine".