1131621611 has 4 divisors (see below), whose sum is σ = 1134607800. Its totient is φ = 1128635424.

The previous prime is 1131621587. The next prime is 1131621641. The reversal of 1131621611 is 1161261311.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1131621611 - 2¹⁰ = 1131620587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131621641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492526 + ... + 1493283.

It is an arithmetic number, because the mean of its divisors is an integer number (283651950).

Almost surely, 2^1131621611 is an apocalyptic number.

1131621611 is a deficient number, since it is larger than the sum of its proper divisors (2986189).

1131621611 is an equidigital number, since it uses as much as digits as its factorization.

1131621611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986188.

The product of its digits is 216, while the sum is 23.

The square root of 1131621611 is about 33639.5839896988. The cubic root of 1131621611 is about 1042.0784405468.

Adding to 1131621611 its reverse (1161261311), we get a palindrome (2292882922).

The spelling of 1131621611 in words is "one billion, one hundred thirty-one million, six hundred twenty-one thousand, six hundred eleven".