1667131 has 2 divisors, whose sum is σ = 1667132. Its totient is φ = 1667130.

The previous prime is 1667077. The next prime is 1667143. The reversal of 1667131 is 1317661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1667131 - 2⁹ = 1666619 is a prime.

It is a super-2 number, since 2×1667131² = 5558651542322, which contains 22 as substring.

It is equal to p₁₂₅₈₂₇ and since 1667131 and 125827 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 1667096 and 1667105.

It is not a weakly prime, because it can be changed into another prime (1668131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833565 + 833566.

It is an arithmetic number, because the mean of its divisors is an integer number (833566).

2^1667131 is an apocalyptic number.

1667131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667131 is an equidigital number, since it uses as much as digits as its factorization.

1667131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 1667131 is about 1291.1742717387. The cubic root of 1667131 is about 118.5741196881.

The spelling of 1667131 in words is "one million, six hundred sixty-seven thousand, one hundred thirty-one".