1249981 has 4 divisors (see below), whose sum is σ = 1304352. Its totient is φ = 1195612.

The previous prime is 1249943. The next prime is 1249999. The reversal of 1249981 is 1899421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1249981 - 2¹³ = 1241789 is a prime.

It is a super-2 number, since 2×1249981² = 3124905000722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249901) 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 in 3 ways as a sum of consecutive naturals, for example, 27151 + ... + 27196.

It is an arithmetic number, because the mean of its divisors is an integer number (326088).

2^1249981 is an apocalyptic number.

It is an amenable number.

1249981 is a deficient number, since it is larger than the sum of its proper divisors (54371).

1249981 is an equidigital number, since it uses as much as digits as its factorization.

1249981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54370.

The product of its digits is 5184, while the sum is 34.

The square root of 1249981 is about 1118.0254916593. The cubic root of 1249981 is about 107.7211887087.

The spelling of 1249981 in words is "one million, two hundred forty-nine thousand, nine hundred eighty-one".