1209931 has 2 divisors, whose sum is σ = 1209932. Its totient is φ = 1209930.

The previous prime is 1209889. The next prime is 1209947. The reversal of 1209931 is 1399021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209931 - 2¹¹ = 1207883 is a prime.

It is a super-2 number, since 2×1209931² = 2927866049522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1209896 and 1209905.

It is not a weakly prime, because it can be changed into another prime (1209631) 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, 604965 + 604966.

It is an arithmetic number, because the mean of its divisors is an integer number (604966).

2^1209931 is an apocalyptic number.

1209931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209931 is an equidigital number, since it uses as much as digits as its factorization.

1209931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1209931 is about 1099.9686359165. The cubic root of 1209931 is about 106.5581981132.

The spelling of 1209931 in words is "one million, two hundred nine thousand, nine hundred thirty-one".