1213614561 has 8 divisors (see below), whose sum is σ = 1640319520. Its totient is φ = 797992992.

The previous prime is 1213614517. The next prime is 1213614613. The reversal of 1213614561 is 1654163121.

It is a happy number.

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

It is not a de Polignac number, because 1213614561 - 2⁹ = 1213614049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213614161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2770591 + ... + 2771028.

It is an arithmetic number, because the mean of its divisors is an integer number (205039940).

Almost surely, 2^1213614561 is an apocalyptic number.

It is an amenable number.

1213614561 is a deficient number, since it is larger than the sum of its proper divisors (426704959).

1213614561 is an equidigital number, since it uses as much as digits as its factorization.

1213614561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5541695.

The product of its digits is 4320, while the sum is 30.

The square root of 1213614561 is about 34836.9711800552. The cubic root of 1213614561 is about 1066.6622520108.

Adding to 1213614561 its reverse (1654163121), we get a palindrome (2867777682).

The spelling of 1213614561 in words is "one billion, two hundred thirteen million, six hundred fourteen thousand, five hundred sixty-one".