1966531 has 4 divisors (see below), whose sum is σ = 2247472. Its totient is φ = 1685592.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966531 is 1356691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1356691 = 7 ⋅193813.

It is a cyclic number.

It is not a de Polignac number, because 1966531 - 2⁵ = 1966499 is a prime.

It is a super-2 number, since 2×1966531² = 7734488347922, which contains 22 as substring.

It is a Duffinian number.

1966531 is a lucky number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1966493 and 1966502.

It is not an unprimeable number, because it can be changed into a prime (1966511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140460 + ... + 140473.

It is an arithmetic number, because the mean of its divisors is an integer number (561868).

2^1966531 is an apocalyptic number.

1966531 is a deficient number, since it is larger than the sum of its proper divisors (280941).

1966531 is an equidigital number, since it uses as much as digits as its factorization.

1966531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280940.

The product of its digits is 4860, while the sum is 31.

The square root of 1966531 is about 1402.3305601747. The cubic root of 1966531 is about 125.2853428069.

The spelling of 1966531 in words is "one million, nine hundred sixty-six thousand, five hundred thirty-one".