992542721 has 4 divisors (see below), whose sum is σ = 992622852. Its totient is φ = 992462592.

The previous prime is 992542709. The next prime is 992542751. The reversal of 992542721 is 127245299.

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 2 ways, for example, as 84364225 + 908178496 = 9185^2 + 30136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-992542721 is a prime.

It is a super-3 number, since 3×992542721³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (992542751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17096 + ... + 47721.

It is an arithmetic number, because the mean of its divisors is an integer number (248155713).

It is a Proth number, since it is equal to 15145 ⋅ 2¹⁶ + 1 and 15145 < 2¹⁶.

Almost surely, 2^992542721 is an apocalyptic number.

It is an amenable number.

992542721 is a deficient number, since it is larger than the sum of its proper divisors (80131).

992542721 is a wasteful number, since it uses less digits than its factorization.

992542721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80130.

The product of its digits is 90720, while the sum is 41.

The square root of 992542721 is about 31504.6460224520. The cubic root of 992542721 is about 997.5080356051.

The spelling of 992542721 in words is "nine hundred ninety-two million, five hundred forty-two thousand, seven hundred twenty-one".