15491038369 has 9 divisors (see below), whose sum is σ = 15721263219. Its totient is φ = 15264142320.

The previous prime is 15491038357. The next prime is 15491038391. The reversal of 15491038369 is 96383019451.

The square root of 15491038369 is 124463.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 438693025 + 15052345344 = 20945^2 + 122688^2 .

It is not a de Polignac number, because 15491038369 - 2⁵ = 15491038337 is a prime.

It is a super-2 number, since 2×15491038369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15491038349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8835997 + ... + 8837749.

Almost surely, 2^15491038369 is an apocalyptic number.

15491038369 is the 124463-rd square number.

15491038369 is the 62232-nd centered octagonal number.

It is an amenable number.

15491038369 is a deficient number, since it is larger than the sum of its proper divisors (230224850).

15491038369 is an frugal number, since it uses more digits than its factorization.

15491038369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648 (or 1824 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

Multiplying 15491038369 by its sum of digits (49), we get a square (759060880081 = 871241²).

The spelling of 15491038369 in words is "fifteen billion, four hundred ninety-one million, thirty-eight thousand, three hundred sixty-nine".