1866131 has 2 divisors, whose sum is σ = 1866132. Its totient is φ = 1866130.

The previous prime is 1866127. The next prime is 1866143. The reversal of 1866131 is 1316681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1866131 - 2² = 1866127 is a prime.

It is a super-2 number, since 2×1866131² = 6964889818322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1866131.

It is not a weakly prime, because it can be changed into another prime (1866101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933065 + 933066.

It is an arithmetic number, because the mean of its divisors is an integer number (933066).

2^1866131 is an apocalyptic number.

1866131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866131 is an equidigital number, since it uses as much as digits as its factorization.

1866131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 1866131 is about 1366.0640541351. The cubic root of 1866131 is about 123.1158711570.

The spelling of 1866131 in words is "one million, eight hundred sixty-six thousand, one hundred thirty-one".