1669931 has 2 divisors, whose sum is σ = 1669932. Its totient is φ = 1669930.

The previous prime is 1669897. The next prime is 1669933. The reversal of 1669931 is 1399661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669931 is a prime.

It is a super-2 number, since 2×1669931² = 5577339089522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1669933, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1669891 and 1669900.

It is not a weakly prime, because it can be changed into another prime (1669933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834965 + 834966.

It is an arithmetic number, because the mean of its divisors is an integer number (834966).

2^1669931 is an apocalyptic number.

1669931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669931 is an equidigital number, since it uses as much as digits as its factorization.

1669931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 35.

The square root of 1669931 is about 1292.2581011547. The cubic root of 1669931 is about 118.6404655714.

The spelling of 1669931 in words is "one million, six hundred sixty-nine thousand, nine hundred thirty-one".