1201135156 has 24 divisors (see below), whose sum is σ = 2271877160. Its totient is φ = 552362112.

The previous prime is 1201135151. The next prime is 1201135163. The reversal of 1201135156 is 6515311021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 512656 + 1200622500 = 716^2 + 34650^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1201135156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201135151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27291 + ... + 56098.

Almost surely, 2^1201135156 is an apocalyptic number.

It is an amenable number.

1201135156 is a deficient number, since it is larger than the sum of its proper divisors (1070742004).

1201135156 is a wasteful number, since it uses less digits than its factorization.

1201135156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83683 (or 83681 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1201135156 is about 34657.3968439639. The cubic root of 1201135156 is about 1062.9935422615.

Adding to 1201135156 its reverse (6515311021), we get a palindrome (7716446177).

The spelling of 1201135156 in words is "one billion, two hundred one million, one hundred thirty-five thousand, one hundred fifty-six".