1131097644 has 36 divisors (see below), whose sum is σ = 2861438944. Its totient is φ = 376732512.

The previous prime is 1131097637. The next prime is 1131097691. The reversal of 1131097644 is 4467901311.

1131097644 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 0 + 9 + 7 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1131097599 and 1131097608.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35934 + ... + 59610.

Almost surely, 2^1131097644 is an apocalyptic number.

It is an amenable number.

1131097644 is an abundant number, since it is smaller than the sum of its proper divisors (1730341300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131097644 is a wasteful number, since it uses less digits than its factorization.

1131097644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25014 (or 25009 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1131097644 is about 33631.7951349612. The cubic root of 1131097644 is about 1041.9175802371.

Adding to 1131097644 its reverse (4467901311), we get a palindrome (5598998955).

The spelling of 1131097644 in words is "one billion, one hundred thirty-one million, ninety-seven thousand, six hundred forty-four".