1201531265 has 16 divisors (see below), whose sum is σ = 1606383360. Its totient is φ = 855246720.

The previous prime is 1201531259. The next prime is 1201531273. The reversal of 1201531265 is 5621351021.

It is not a de Polignac number, because 1201531265 - 2¹⁰ = 1201530241 is a prime.

It is a Curzon 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, 229820 + ... + 234989.

It is an arithmetic number, because the mean of its divisors is an integer number (100398960).

Almost surely, 2^1201531265 is an apocalyptic number.

It is an amenable number.

1201531265 is a deficient number, since it is larger than the sum of its proper divisors (404852095).

1201531265 is a wasteful number, since it uses less digits than its factorization.

1201531265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464872.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1201531265 is about 34663.1110115639. Note that the first 3 decimals coincide. The cubic root of 1201531265 is about 1063.1103803569.

Adding to 1201531265 its reverse (5621351021), we get a palindrome (6822882286).

The spelling of 1201531265 in words is "one billion, two hundred one million, five hundred thirty-one thousand, two hundred sixty-five".