11930913581 has 8 divisors (see below), whose sum is σ = 12187295640. Its totient is φ = 11675689792.

The previous prime is 11930913569. The next prime is 11930913619. The reversal of 11930913581 is 18531903911.

11930913581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1054300900 + 10876612681 = 32470^2 + 104291^2 .

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 11930913581 - 2⁶ = 11930913517 is a prime.

It is a super-2 number, since 2×11930913581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11930913521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268730 + ... + 309963.

It is an arithmetic number, because the mean of its divisors is an integer number (1523411955).

Almost surely, 2^11930913581 is an apocalyptic number.

It is an amenable number.

11930913581 is a deficient number, since it is larger than the sum of its proper divisors (256382059).

11930913581 is an equidigital number, since it uses as much as digits as its factorization.

11930913581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579135.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 11930913581 in words is "eleven billion, nine hundred thirty million, nine hundred thirteen thousand, five hundred eighty-one".