201511131 has 8 divisors (see below), whose sum is σ = 282822720. Its totient is φ = 127270152.

The previous prime is 201511127. The next prime is 201511147. The reversal of 201511131 is 131115102.

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

It is not a de Polignac number, because 201511131 - 2² = 201511127 is a prime.

It is a super-2 number, since 2×201511131² = 81213471833798322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201511131.

It is not an unprimeable number, because it can be changed into a prime (201511031) 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, 1767585 + ... + 1767698.

It is an arithmetic number, because the mean of its divisors is an integer number (35352840).

Almost surely, 2^201511131 is an apocalyptic number.

201511131 is a deficient number, since it is larger than the sum of its proper divisors (81311589).

201511131 is a wasteful number, since it uses less digits than its factorization.

201511131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535305.

The product of its (nonzero) digits is 30, while the sum is 15.

The square root of 201511131 is about 14195.4616339167. The cubic root of 201511131 is about 586.2727116161.

Adding to 201511131 its reverse (131115102), we get a palindrome (332626233).

It can be divided in two parts, 20 and 1511131, that added together give a palindrome (1511151).

The spelling of 201511131 in words is "two hundred one million, five hundred eleven thousand, one hundred thirty-one".