1220186613 has 4 divisors (see below), whose sum is σ = 1626915488. Its totient is φ = 813457740.

The previous prime is 1220186579. The next prime is 1220186621. The reversal of 1220186613 is 3166810221.

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 1220186613 - 2¹⁴ = 1220170229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220186623) 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, 203364433 + ... + 203364438.

It is an arithmetic number, because the mean of its divisors is an integer number (406728872).

Almost surely, 2^1220186613 is an apocalyptic number.

It is an amenable number.

1220186613 is a deficient number, since it is larger than the sum of its proper divisors (406728875).

1220186613 is an equidigital number, since it uses as much as digits as its factorization.

1220186613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406728874.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1220186613 is about 34931.1696483241. The cubic root of 1220186613 is about 1068.5842086659.

Adding to 1220186613 its reverse (3166810221), we get a palindrome (4386996834).

The spelling of 1220186613 in words is "one billion, two hundred twenty million, one hundred eighty-six thousand, six hundred thirteen".