1213816601 has 4 divisors (see below), whose sum is σ = 1214440704. Its totient is φ = 1213192500.

The previous prime is 1213816567. The next prime is 1213816607. The reversal of 1213816601 is 1066183121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1066183121 = 2861 ⋅372661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213816601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213816607) 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, 309125 + ... + 313026.

It is an arithmetic number, because the mean of its divisors is an integer number (303610176).

Almost surely, 2^1213816601 is an apocalyptic number.

It is an amenable number.

1213816601 is a deficient number, since it is larger than the sum of its proper divisors (624103).

1213816601 is an equidigital number, since it uses as much as digits as its factorization.

1213816601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624102.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1213816601 is about 34839.8708522291. The cubic root of 1213816601 is about 1066.7214406226.

Adding to 1213816601 its reverse (1066183121), we get a palindrome (2279999722).

The spelling of 1213816601 in words is "one billion, two hundred thirteen million, eight hundred sixteen thousand, six hundred one".