61131843331 has 4 divisors (see below), whose sum is σ = 65834292832. Its totient is φ = 56429393832.

The previous prime is 61131843307. The next prime is 61131843389. The reversal of 61131843331 is 13334813116.

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 61131843331 - 2⁷ = 61131843203 is a prime.

It is a super-2 number, since 2×61131843331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61131843301) 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, 2351224731 + ... + 2351224756.

It is an arithmetic number, because the mean of its divisors is an integer number (16458573208).

Almost surely, 2^61131843331 is an apocalyptic number.

61131843331 is a deficient number, since it is larger than the sum of its proper divisors (4702449501).

61131843331 is a wasteful number, since it uses less digits than its factorization.

61131843331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702449500.

The product of its digits is 15552, while the sum is 34.

The spelling of 61131843331 in words is "sixty-one billion, one hundred thirty-one million, eight hundred forty-three thousand, three hundred thirty-one".