61981184313 has 32 divisors (see below), whose sum is σ = 94871828480. Its totient is φ = 39967920720.

The previous prime is 61981184303. The next prime is 61981184327. The reversal of 61981184313 is 31348118916.

61981184313 is a `hidden beast` number, since 619 + 8 + 1 + 18 + 4 + 3 + 13 = 666.

It is not a de Polignac number, because 61981184313 - 2⁶ = 61981184249 is a prime.

It is a super-3 number, since 3×61981184313³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61981184303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139573 + ... + 378738.

It is an arithmetic number, because the mean of its divisors is an integer number (2964744640).

Almost surely, 2^61981184313 is an apocalyptic number.

It is an amenable number.

61981184313 is a deficient number, since it is larger than the sum of its proper divisors (32890644167).

61981184313 is a wasteful number, since it uses less digits than its factorization.

61981184313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518466 (or 518460 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The spelling of 61981184313 in words is "sixty-one billion, nine hundred eighty-one million, one hundred eighty-four thousand, three hundred thirteen".