1206344981 has 4 divisors (see below), whose sum is σ = 1206749964. Its totient is φ = 1205940000.

The previous prime is 1206344977. The next prime is 1206344989. The reversal of 1206344981 is 1894436021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1039030756 + 167314225 = 32234^2 + 12935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206344981 - 2² = 1206344977 is a prime.

It is a super-2 number, since 2×1206344981² = 2910536426367780722, 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 (1206344989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197990 + ... + 203991.

It is an arithmetic number, because the mean of its divisors is an integer number (301687491).

Almost surely, 2^1206344981 is an apocalyptic number.

It is an amenable number.

1206344981 is a deficient number, since it is larger than the sum of its proper divisors (404983).

1206344981 is an equidigital number, since it uses as much as digits as its factorization.

1206344981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404982.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1206344981 is about 34732.4773231050. The cubic root of 1206344981 is about 1064.5282079356.

The spelling of 1206344981 in words is "one billion, two hundred six million, three hundred forty-four thousand, nine hundred eighty-one".