13923671581 has 4 divisors (see below), whose sum is σ = 13924019232. Its totient is φ = 13923323932.

The previous prime is 13923671537. The next prime is 13923671639. The reversal of 13923671581 is 18517632931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13923671581 is a prime.

It is a super-2 number, since 2×13923671581² (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 (13923671681) 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, 104545 + ... + 196918.

It is an arithmetic number, because the mean of its divisors is an integer number (3481004808).

Almost surely, 2^13923671581 is an apocalyptic number.

It is an amenable number.

13923671581 is a deficient number, since it is larger than the sum of its proper divisors (347651).

13923671581 is an equidigital number, since it uses as much as digits as its factorization.

13923671581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347650.

The product of its digits is 272160, while the sum is 46.

The spelling of 13923671581 in words is "thirteen billion, nine hundred twenty-three million, six hundred seventy-one thousand, five hundred eighty-one".