291672364489 has 27 divisors (see below), whose sum is σ = 332231120949. Its totient is φ = 255862141920.

The previous prime is 291672364397. The next prime is 291672364549. The reversal of 291672364489 is 984463276192.

It is a happy number.

The square root of 291672364489 is 540067.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2667206025 + 289005158464 = 51645^2 + 537592^2 .

It is not a de Polignac number, because 291672364489 - 2¹¹ = 291672362441 is a prime.

It is a super-2 number, since 2×291672364489² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291672367489) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 172280527 + ... + 172282219.

Almost surely, 2^291672364489 is an apocalyptic number.

291672364489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

291672364489 is the 540067-th square number.

291672364489 is the 270034-th centered octagonal number.

It is an amenable number.

291672364489 is a deficient number, since it is larger than the sum of its proper divisors (40558756460).

291672364489 is an frugal number, since it uses more digits than its factorization.

291672364489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466 (or 1733 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 61.

The spelling of 291672364489 in words is "two hundred ninety-one billion, six hundred seventy-two million, three hundred sixty-four thousand, four hundred eighty-nine".