249139741321 has 3 divisors (see below), whose sum is σ = 249140240461. Its totient is φ = 249139242182.

The previous prime is 249139741247. The next prime is 249139741343. The reversal of 249139741321 is 123147931942.

The square root of 249139741321 is 499139.

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 not a de Polignac number, because 249139741321 - 2¹⁷ = 249139610249 is a prime.

It is a super-2 number, since 2×249139741321² (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 (249139741391) 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, 249570 + ... + 748708.

Almost surely, 2^249139741321 is an apocalyptic number.

249139741321 is the 499139-th square number.

249139741321 is the 249570-th centered octagonal number.

It is an amenable number.

249139741321 is a deficient number, since it is larger than the sum of its proper divisors (499140).

249139741321 is an frugal number, since it uses more digits than its factorization.

249139741321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998278 (or 499139 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The spelling of 249139741321 in words is "two hundred forty-nine billion, one hundred thirty-nine million, seven hundred forty-one thousand, three hundred twenty-one".