990731564743 has 2 divisors, whose sum is σ = 990731564744. Its totient is φ = 990731564742.

The previous prime is 990731564741. The next prime is 990731564747. The reversal of 990731564743 is 347465137099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990731564743 - 2¹ = 990731564741 is a prime.

It is a super-2 number, since 2×990731564743² (a number of 25 digits) contains 22 as substring.

Together with 990731564741, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990731564741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495365782371 + 495365782372.

It is an arithmetic number, because the mean of its divisors is an integer number (495365782372).

Almost surely, 2^990731564743 is an apocalyptic number.

990731564743 is a deficient number, since it is larger than the sum of its proper divisors (1).

990731564743 is an equidigital number, since it uses as much as digits as its factorization.

990731564743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 58.

The spelling of 990731564743 in words is "nine hundred ninety billion, seven hundred thirty-one million, five hundred sixty-four thousand, seven hundred forty-three".