1980531 has 30 divisors (see below), whose sum is σ = 3448500. Its totient is φ = 1129464.

The previous prime is 1980529. The next prime is 1980577. The reversal of 1980531 is 1350891.

It is not a de Polignac number, because 1980531 - 2¹ = 1980529 is a prime.

It is a super-2 number, since 2×1980531² = 7845006083922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1980495 and 1980504.

It is not an unprimeable number, because it can be changed into a prime (1980521) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3720 + ... + 4218.

It is an arithmetic number, because the mean of its divisors is an integer number (114950).

2^1980531 is an apocalyptic number.

1980531 is a deficient number, since it is larger than the sum of its proper divisors (1467969).

1980531 is an equidigital number, since it uses as much as digits as its factorization.

1980531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1980531 is about 1407.3133979324. The cubic root of 1980531 is about 125.5819478227.

The spelling of 1980531 in words is "one million, nine hundred eighty thousand, five hundred thirty-one".