1145631101 has 4 divisors (see below), whose sum is σ = 1146051804. Its totient is φ = 1145210400.

The previous prime is 1145631031. The next prime is 1145631103. The reversal of 1145631101 is 1011365411.

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 816244900 + 329386201 = 28570^2 + 18149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145631101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145631103) 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, 206240 + ... + 211721.

It is an arithmetic number, because the mean of its divisors is an integer number (286512951).

Almost surely, 2^1145631101 is an apocalyptic number.

It is an amenable number.

1145631101 is a deficient number, since it is larger than the sum of its proper divisors (420703).

1145631101 is an equidigital number, since it uses as much as digits as its factorization.

1145631101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420702.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1145631101 is about 33847.1727179686. The cubic root of 1145631101 is about 1046.3611304195.

Adding to 1145631101 its reverse (1011365411), we get a palindrome (2156996512).

The spelling of 1145631101 in words is "one billion, one hundred forty-five million, six hundred thirty-one thousand, one hundred one".