1213620365 has 4 divisors (see below), whose sum is σ = 1456344444. Its totient is φ = 970896288.

The previous prime is 1213620337. The next prime is 1213620409. The reversal of 1213620365 is 5630263121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 887384521 + 326235844 = 29789^2 + 18062^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213620365 - 2¹² = 1213616269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121362032 + ... + 121362041.

It is an arithmetic number, because the mean of its divisors is an integer number (364086111).

Almost surely, 2^1213620365 is an apocalyptic number.

It is an amenable number.

1213620365 is a deficient number, since it is larger than the sum of its proper divisors (242724079).

1213620365 is an equidigital number, since it uses as much as digits as its factorization.

1213620365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242724078.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1213620365 is about 34837.0544822607. The cubic root of 1213620365 is about 1066.6639524128.

Adding to 1213620365 its reverse (5630263121), we get a palindrome (6843883486).

The spelling of 1213620365 in words is "one billion, two hundred thirteen million, six hundred twenty thousand, three hundred sixty-five".