1131511201 has 4 divisors (see below), whose sum is σ = 1144224900. Its totient is φ = 1118797504.

The previous prime is 1131511189. The next prime is 1131511247. The reversal of 1131511201 is 1021151311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 350588176 + 780923025 = 18724^2 + 27945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131511201 - 2⁹ = 1131510689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131511001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6356716 + ... + 6356893.

It is an arithmetic number, because the mean of its divisors is an integer number (286056225).

Almost surely, 2^1131511201 is an apocalyptic number.

It is an amenable number.

1131511201 is a deficient number, since it is larger than the sum of its proper divisors (12713699).

1131511201 is an equidigital number, since it uses as much as digits as its factorization.

1131511201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12713698.

The product of its (nonzero) digits is 30, while the sum is 16.

The square root of 1131511201 is about 33637.9428770548. The cubic root of 1131511201 is about 1042.0445482923.

Adding to 1131511201 its reverse (1021151311), we get a palindrome (2152662512).

The spelling of 1131511201 in words is "one billion, one hundred thirty-one million, five hundred eleven thousand, two hundred one".