1199981 has 6 divisors (see below), whose sum is σ = 1223082. Its totient is φ = 1177200.

The previous prime is 1199969. The next prime is 1199993. The reversal of 1199981 is 1899911.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1199969) and next prime (1199993).

It can be written as a sum of positive squares in 3 ways, for example, as 722500 + 477481 = 850^2 + 691^2 .

It is not a de Polignac number, because 1199981 - 2¹⁴ = 1183597 is a prime.

It is a super-2 number, since 2×1199981² = 2879908800722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1159981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10955 + ... + 11063.

It is an arithmetic number, because the mean of its divisors is an integer number (203847).

2^1199981 is an apocalyptic number.

It is an amenable number.

1199981 is a deficient number, since it is larger than the sum of its proper divisors (23101).

1199981 is an equidigital number, since it uses as much as digits as its factorization.

1199981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 210 counting only the distinct ones).

The product of its digits is 5832, while the sum is 38.

The square root of 1199981 is about 1095.4364427022. The cubic root of 1199981 is about 106.2652960677.

The spelling of 1199981 in words is "one million, one hundred ninety-nine thousand, nine hundred eighty-one".