1217206361 has 4 divisors (see below), whose sum is σ = 1391092992. Its totient is φ = 1043319732.

The previous prime is 1217206349. The next prime is 1217206369. The reversal of 1217206361 is 1636027121.

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 not a de Polignac number, because 1217206361 - 2¹⁴ = 1217189977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1217206369) 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, 86943305 + ... + 86943318.

It is an arithmetic number, because the mean of its divisors is an integer number (347773248).

Almost surely, 2^1217206361 is an apocalyptic number.

It is an amenable number.

1217206361 is a deficient number, since it is larger than the sum of its proper divisors (173886631).

1217206361 is an equidigital number, since it uses as much as digits as its factorization.

1217206361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173886630.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1217206361 is about 34888.4846475166. The cubic root of 1217206361 is about 1067.7135094619.

The spelling of 1217206361 in words is "one billion, two hundred seventeen million, two hundred six thousand, three hundred sixty-one".