1219931 has 2 divisors, whose sum is σ = 1219932. Its totient is φ = 1219930.

The previous prime is 1219919. The next prime is 1219949. The reversal of 1219931 is 1399121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1399121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219931 is a prime.

It is a super-2 number, since 2×1219931² = 2976463289522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1219931.

It is not a weakly prime, because it can be changed into another prime (1219951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609965 + 609966.

It is an arithmetic number, because the mean of its divisors is an integer number (609966).

2^1219931 is an apocalyptic number.

1219931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219931 is an equidigital number, since it uses as much as digits as its factorization.

1219931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 26.

The square root of 1219931 is about 1104.5048664447. The cubic root of 1219931 is about 106.8509585356.

The spelling of 1219931 in words is "one million, two hundred nineteen thousand, nine hundred thirty-one".