4185561131 has 4 divisors (see below), whose sum is σ = 4320579264. Its totient is φ = 4050543000.

The previous prime is 4185561113. The next prime is 4185561139. The reversal of 4185561131 is 1311655814.

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 4185561131 - 2³⁰ = 3111819307 is a prime.

It is a super-2 number, since 2×4185561131² = 35037843962675998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4185561091 and 4185561100.

It is not an unprimeable number, because it can be changed into a prime (4185561139) 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, 67509020 + ... + 67509081.

It is an arithmetic number, because the mean of its divisors is an integer number (1080144816).

Almost surely, 2^4185561131 is an apocalyptic number.

4185561131 is a deficient number, since it is larger than the sum of its proper divisors (135018133).

4185561131 is a wasteful number, since it uses less digits than its factorization.

4185561131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135018132.

The product of its digits is 14400, while the sum is 35.

The square root of 4185561131 is about 64695.9127843483. The cubic root of 4185561131 is about 1611.5776276177.

The spelling of 4185561131 in words is "four billion, one hundred eighty-five million, five hundred sixty-one thousand, one hundred thirty-one".