1201156565 has 16 divisors (see below), whose sum is σ = 1662418560. Its totient is φ = 816091200.

The previous prime is 1201156553. The next prime is 1201156571. The reversal of 1201156565 is 5656511021.

It is not a de Polignac number, because 1201156565 - 2¹⁰ = 1201155541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153611 + ... + 161240.

It is an arithmetic number, because the mean of its divisors is an integer number (103901160).

Almost surely, 2^1201156565 is an apocalyptic number.

It is an amenable number.

1201156565 is a deficient number, since it is larger than the sum of its proper divisors (461261995).

1201156565 is a wasteful number, since it uses less digits than its factorization.

1201156565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314972.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1201156565 is about 34657.7057088319. The cubic root of 1201156565 is about 1062.9998578132. Note that the first 3 decimals are identical.

Adding to 1201156565 its reverse (5656511021), we get a palindrome (6857667586).

The spelling of 1201156565 in words is "one billion, two hundred one million, one hundred fifty-six thousand, five hundred sixty-five".