611561324131 has 4 divisors (see below), whose sum is σ = 612137726064. Its totient is φ = 610984922200.

The previous prime is 611561324123. The next prime is 611561324161. The reversal of 611561324131 is 131423165116.

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 611561324131 - 2³ = 611561324123 is a prime.

It is a super-2 number, since 2×611561324131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611561324161) 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, 288199375 + ... + 288201496.

It is an arithmetic number, because the mean of its divisors is an integer number (153034431516).

Almost surely, 2^611561324131 is an apocalyptic number.

611561324131 is a deficient number, since it is larger than the sum of its proper divisors (576401933).

611561324131 is a wasteful number, since it uses less digits than its factorization.

611561324131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576401932.

The product of its digits is 12960, while the sum is 34.

Adding to 611561324131 its reverse (131423165116), we get a palindrome (742984489247).

The spelling of 611561324131 in words is "six hundred eleven billion, five hundred sixty-one million, three hundred twenty-four thousand, one hundred thirty-one".