492351721 has 3 divisors (see below), whose sum is σ = 492373911. Its totient is φ = 492329532.

The previous prime is 492351719. The next prime is 492351733. The reversal of 492351721 is 127153294.

It is a happy number.

The square root of 492351721 is 22189.

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 can be written as a sum of positive squares in only one way, i.e., 329023321 + 163328400 = 18139^2 + 12780^2 .

It is not a de Polignac number, because 492351721 - 2¹ = 492351719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492351751) 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, 11095 + ... + 33283.

It is an arithmetic number, because the mean of its divisors is an integer number (164124637).

Almost surely, 2^492351721 is an apocalyptic number.

492351721 is the 22189-th square number.

492351721 is the 11095-th centered octagonal number.

It is an amenable number.

492351721 is a deficient number, since it is larger than the sum of its proper divisors (22190).

492351721 is an frugal number, since it uses more digits than its factorization.

492351721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44378 (or 22189 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The cubic root of 492351721 is about 789.6327519120.

It can be divided in two parts, 4923 and 51721, that added together give a square (56644 = 238²).

The spelling of 492351721 in words is "four hundred ninety-two million, three hundred fifty-one thousand, seven hundred twenty-one".