3131669 has 2 divisors, whose sum is σ = 3131670. Its totient is φ = 3131668.

The previous prime is 3131641. The next prime is 3131671. The reversal of 3131669 is 9661313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 69169 = 1750^2 + 263^2 .

It is an emirp because it is prime and its reverse (9661313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131669 is a prime.

It is a super-2 number, since 2×3131669² = 19614701451122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 3131671, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565834 + 1565835.

It is an arithmetic number, because the mean of its divisors is an integer number (1565835).

Almost surely, 2^3131669 is an apocalyptic number.

It is an amenable number.

3131669 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131669 is an equidigital number, since it uses as much as digits as its factorization.

3131669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 3131669 is about 1769.6522257212. The cubic root of 3131669 is about 146.3048144787.

The spelling of 3131669 in words is "three million, one hundred thirty-one thousand, six hundred sixty-nine".