1980431 has 2 divisors, whose sum is σ = 1980432. Its totient is φ = 1980430.

The previous prime is 1980413. The next prime is 1980443. The reversal of 1980431 is 1340891.

Together with previous prime (1980413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1340891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1980431 - 2⁶ = 1980367 is a prime.

It is a super-2 number, since 2×1980431² = 7844213891522, which contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1980431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980401) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990215 + 990216.

It is an arithmetic number, because the mean of its divisors is an integer number (990216).

2^1980431 is an apocalyptic number.

1980431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980431 is an equidigital number, since it uses as much as digits as its factorization.

1980431 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1980431 is about 1407.2778687949. The cubic root of 1980431 is about 125.5798341798.

The spelling of 1980431 in words is "one million, nine hundred eighty thousand, four hundred thirty-one".