291192982129 has 27 divisors (see below), whose sum is σ = 341986299993. Its totient is φ = 247220722728.

The previous prime is 291192982127. The next prime is 291192982139. The reversal of 291192982129 is 921289291192.

The square root of 291192982129 is 539623.

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

It is not a de Polignac number, because 291192982129 - 2¹ = 291192982127 is a prime.

It is a super-2 number, since 2×291192982129² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291192982129.

It is not an unprimeable number, because it can be changed into a prime (291192982123) 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, 479724544 + ... + 479725150.

It is an arithmetic number, because the mean of its divisors is an integer number (12666159259).

Almost surely, 2^291192982129 is an apocalyptic number.

291192982129 is the 539623-rd square number.

291192982129 is the 269812-nd centered octagonal number.

It is an amenable number.

291192982129 is a deficient number, since it is larger than the sum of its proper divisors (50793317864).

291192982129 is an frugal number, since it uses more digits than its factorization.

291192982129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 741 counting only the distinct ones).

The product of its digits is 839808, while the sum is 55.

The spelling of 291192982129 in words is "two hundred ninety-one billion, one hundred ninety-two million, nine hundred eighty-two thousand, one hundred twenty-nine".