1213465565 has 8 divisors (see below), whose sum is σ = 1568170968. Its totient is φ = 896097600.

The previous prime is 1213465537. The next prime is 1213465573. The reversal of 1213465565 is 5655643121.

It can be written as a sum of positive squares in 4 ways, for example, as 32649796 + 1180815769 = 5714^2 + 34363^2 .

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

It is not a de Polignac number, because 1213465565 - 2¹⁰ = 1213464541 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 9334286 + ... + 9334415.

It is an arithmetic number, because the mean of its divisors is an integer number (196021371).

Almost surely, 2^1213465565 is an apocalyptic number.

It is an amenable number.

1213465565 is a deficient number, since it is larger than the sum of its proper divisors (354705403).

1213465565 is a wasteful number, since it uses less digits than its factorization.

1213465565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668719.

The product of its digits is 108000, while the sum is 38.

The square root of 1213465565 is about 34834.8326391846. The cubic root of 1213465565 is about 1066.6185986911.

The spelling of 1213465565 in words is "one billion, two hundred thirteen million, four hundred sixty-five thousand, five hundred sixty-five".