1206437561 has 8 divisors (see below), whose sum is σ = 1438733184. Its totient is φ = 989128800.

The previous prime is 1206437549. The next prime is 1206437567. The reversal of 1206437561 is 1657346021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1206437561 - 2³⁰ = 132695737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1206437567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3746540 + ... + 3746861.

It is an arithmetic number, because the mean of its divisors is an integer number (179841648).

Almost surely, 2^1206437561 is an apocalyptic number.

It is an amenable number.

1206437561 is a deficient number, since it is larger than the sum of its proper divisors (232295623).

1206437561 is an equidigital number, since it uses as much as digits as its factorization.

1206437561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493431.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1206437561 is about 34733.8100559095. The cubic root of 1206437561 is about 1064.5554393666. Note that the first 3 decimals are identical.

The spelling of 1206437561 in words is "one billion, two hundred six million, four hundred thirty-seven thousand, five hundred sixty-one".