15491131723 has 4 divisors (see below), whose sum is σ = 15595099200. Its totient is φ = 15387164248.

The previous prime is 15491131687. The next prime is 15491131727. The reversal of 15491131723 is 32713119451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32713119451 = 19 ⋅1721743129.

It is a cyclic number.

It is not a de Polignac number, because 15491131723 - 2⁹ = 15491131211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15491131727) 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, 51983515 + ... + 51983812.

It is an arithmetic number, because the mean of its divisors is an integer number (3898774800).

Almost surely, 2^15491131723 is an apocalyptic number.

15491131723 is a deficient number, since it is larger than the sum of its proper divisors (103967477).

15491131723 is a wasteful number, since it uses less digits than its factorization.

15491131723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103967476.

The product of its digits is 22680, while the sum is 37.

The spelling of 15491131723 in words is "fifteen billion, four hundred ninety-one million, one hundred thirty-one thousand, seven hundred twenty-three".