1229981 has 2 divisors, whose sum is σ = 1229982. Its totient is φ = 1229980.

The previous prime is 1229957. The next prime is 1229993. The reversal of 1229981 is 1899221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 100 = 1109^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229981 is a prime.

It is a super-2 number, since 2×1229981² = 3025706520722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614990 + 614991.

It is an arithmetic number, because the mean of its divisors is an integer number (614991).

2^1229981 is an apocalyptic number.

It is an amenable number.

1229981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229981 is an equidigital number, since it uses as much as digits as its factorization.

1229981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 1229981 is about 1109.0450847463. The cubic root of 1229981 is about 107.1435752756.

The spelling of 1229981 in words is "one million, two hundred twenty-nine thousand, nine hundred eighty-one".