731242821 has 8 divisors (see below), whose sum is σ = 997664800. Its totient is φ = 476158032.

The previous prime is 731242819. The next prime is 731242829. The reversal of 731242821 is 128242137.

731242821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 731242821 - 2¹ = 731242819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731242829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2834146 + ... + 2834403.

It is an arithmetic number, because the mean of its divisors is an integer number (124708100).

Almost surely, 2^731242821 is an apocalyptic number.

It is an amenable number.

731242821 is a deficient number, since it is larger than the sum of its proper divisors (266421979).

731242821 is a wasteful number, since it uses less digits than its factorization.

731242821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668595.

The product of its digits is 5376, while the sum is 30.

The square root of 731242821 is about 27041.5018258972. The cubic root of 731242821 is about 900.9220266899.

Adding to 731242821 its reverse (128242137), we get a palindrome (859484958).

The spelling of 731242821 in words is "seven hundred thirty-one million, two hundred forty-two thousand, eight hundred twenty-one".