731632121 has 4 divisors (see below), whose sum is σ = 798144144. Its totient is φ = 665120100.

The previous prime is 731632091. The next prime is 731632157. The reversal of 731632121 is 121236137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 731632121 - 2¹⁰ = 731631097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731632171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33255995 + ... + 33256016.

It is an arithmetic number, because the mean of its divisors is an integer number (199536036).

Almost surely, 2^731632121 is an apocalyptic number.

It is an amenable number.

731632121 is a deficient number, since it is larger than the sum of its proper divisors (66512023).

731632121 is a wasteful number, since it uses less digits than its factorization.

731632121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66512022.

The product of its digits is 1512, while the sum is 26.

The square root of 731632121 is about 27048.6990629864. The cubic root of 731632121 is about 901.0818763380.

Adding to 731632121 its reverse (121236137), we get a palindrome (852868258).

The spelling of 731632121 in words is "seven hundred thirty-one million, six hundred thirty-two thousand, one hundred twenty-one".