731142991 has 2 divisors, whose sum is σ = 731142992. Its totient is φ = 731142990.

The previous prime is 731142917. The next prime is 731143001. The reversal of 731142991 is 199241137.

It is a strong prime.

It is an emirp because it is prime and its reverse (199241137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731142991 - 2¹⁹ = 730618703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 731142991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731142901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365571495 + 365571496.

It is an arithmetic number, because the mean of its divisors is an integer number (365571496).

Almost surely, 2^731142991 is an apocalyptic number.

731142991 is a deficient number, since it is larger than the sum of its proper divisors (1).

731142991 is an equidigital number, since it uses as much as digits as its factorization.

731142991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 731142991 is about 27039.6558964792. The cubic root of 731142991 is about 900.8810265659.

The spelling of 731142991 in words is "seven hundred thirty-one million, one hundred forty-two thousand, nine hundred ninety-one".