990373547291 has 2 divisors, whose sum is σ = 990373547292. Its totient is φ = 990373547290.

The previous prime is 990373547287. The next prime is 990373547309. The reversal of 990373547291 is 192745373099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990373547291 - 2² = 990373547287 is a prime.

It is a super-2 number, since 2×990373547291² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990373547291.

It is not a weakly prime, because it can be changed into another prime (990373547591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495186773645 + 495186773646.

It is an arithmetic number, because the mean of its divisors is an integer number (495186773646).

Almost surely, 2^990373547291 is an apocalyptic number.

990373547291 is a deficient number, since it is larger than the sum of its proper divisors (1).

990373547291 is an equidigital number, since it uses as much as digits as its factorization.

990373547291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12859560, while the sum is 59.

The spelling of 990373547291 in words is "nine hundred ninety billion, three hundred seventy-three million, five hundred forty-seven thousand, two hundred ninety-one".