15491181379 has 4 divisors (see below), whose sum is σ = 15491742184. Its totient is φ = 15490620576.

The previous prime is 15491181367. The next prime is 15491181389. The reversal of 15491181379 is 97318119451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97318119451 = 7 ⋅13902588493.

It is a cyclic number.

It is not a de Polignac number, because 15491181379 - 2⁵ = 15491181347 is a prime.

It is a super-3 number, since 3×15491181379³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15491181359) 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, 236697 + ... + 294970.

It is an arithmetic number, because the mean of its divisors is an integer number (3872935546).

Almost surely, 2^15491181379 is an apocalyptic number.

15491181379 is a deficient number, since it is larger than the sum of its proper divisors (560805).

15491181379 is an equidigital number, since it uses as much as digits as its factorization.

15491181379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560804.

The product of its digits is 272160, while the sum is 49.

The spelling of 15491181379 in words is "fifteen billion, four hundred ninety-one million, one hundred eighty-one thousand, three hundred seventy-nine".