1210981 has 4 divisors (see below), whose sum is σ = 1213632. Its totient is φ = 1208332.

The previous prime is 1210967. The next prime is 1210987. The reversal of 1210981 is 1890121.

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 1210981 - 2⁵ = 1210949 is a prime.

It is a super-2 number, since 2×1210981² = 2932949964722, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210987) 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, 445 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (303408).

2^1210981 is an apocalyptic number.

It is an amenable number.

1210981 is a deficient number, since it is larger than the sum of its proper divisors (2651).

1210981 is an equidigital number, since it uses as much as digits as its factorization.

1210981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1210981 is about 1100.4458187480. The cubic root of 1210981 is about 106.5890135779.

The spelling of 1210981 in words is "one million, two hundred ten thousand, nine hundred eighty-one".