239729822870521 has 3 divisors (see below), whose sum is σ = 239729838353733. Its totient is φ = 239729807387310.

The previous prime is 239729822870509. The next prime is 239729822870639. The reversal of 239729822870521 is 125078228927932.

The square root of 239729822870521 is 15483211.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-239729822870521 is a prime.

It is a super-2 number, since 2×239729822870521² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239729822870501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7741606 + ... + 23224816.

It is an arithmetic number, because the mean of its divisors is an integer number (79909946117911).

Almost surely, 2^{239729822870521} is an apocalyptic number.

239729822870521 is the 15483211-st square number.

239729822870521 is the 7741606-th centered octagonal number.

It is an amenable number.

239729822870521 is a deficient number, since it is larger than the sum of its proper divisors (15483212).

239729822870521 is an frugal number, since it uses more digits than its factorization.

239729822870521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30966422 (or 15483211 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 67.

The spelling of 239729822870521 in words is "two hundred thirty-nine trillion, seven hundred twenty-nine billion, eight hundred twenty-two million, eight hundred seventy thousand, five hundred twenty-one".