61130291891 has 8 divisors (see below), whose sum is σ = 64729586880. Its totient is φ = 57531374208.

The previous prime is 61130291879. The next prime is 61130291899. The reversal of 61130291891 is 19819203116.

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 61130291891 - 2¹⁸ = 61130029747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61130291899) 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, 282230 + ... + 449348.

It is an arithmetic number, because the mean of its divisors is an integer number (8091198360).

Almost surely, 2^61130291891 is an apocalyptic number.

61130291891 is a deficient number, since it is larger than the sum of its proper divisors (3599294989).

61130291891 is a wasteful number, since it uses less digits than its factorization.

61130291891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188653.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 61130291891 in words is "sixty-one billion, one hundred thirty million, two hundred ninety-one thousand, eight hundred ninety-one".