1123611507581 has 8 divisors (see below), whose sum is σ = 1129347273600. Its totient is φ = 1117884362560.

The previous prime is 1123611507553. The next prime is 1123611507607. The reversal of 1123611507581 is 1857051163211.

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

It is a cyclic number.

It is not a de Polignac number, because 1123611507581 - 2⁶ = 1123611507517 is a prime.

It is a super-2 number, since 2×1123611507581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123611507481) 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, 1893836 + ... + 2415333.

It is an arithmetic number, because the mean of its divisors is an integer number (141168409200).

Almost surely, 2^{1123611507581} is an apocalyptic number.

It is an amenable number.

1123611507581 is a deficient number, since it is larger than the sum of its proper divisors (5735766019).

1123611507581 is a wasteful number, since it uses less digits than its factorization.

1123611507581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310499.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 1123611507581 in words is "one trillion, one hundred twenty-three billion, six hundred eleven million, five hundred seven thousand, five hundred eighty-one".