731242751 has 4 divisors (see below), whose sum is σ = 731555352. Its totient is φ = 730930152.

The previous prime is 731242691. The next prime is 731242753. The reversal of 731242751 is 157242137.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 731242751 - 2²⁶ = 664133887 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 (731242753) 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, 152765 + ... + 157478.

It is an arithmetic number, because the mean of its divisors is an integer number (182888838).

Almost surely, 2^731242751 is an apocalyptic number.

731242751 is a deficient number, since it is larger than the sum of its proper divisors (312601).

731242751 is a wasteful number, since it uses less digits than its factorization.

731242751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312600.

The product of its digits is 11760, while the sum is 32.

The square root of 731242751 is about 27041.5005315903. The cubic root of 731242751 is about 900.9219979423.

Adding to 731242751 its reverse (157242137), we get a palindrome (888484888).

The spelling of 731242751 in words is "seven hundred thirty-one million, two hundred forty-two thousand, seven hundred fifty-one".