990147973 has 2 divisors, whose sum is σ = 990147974. Its totient is φ = 990147972.

The previous prime is 990147959. The next prime is 990147989. The reversal of 990147973 is 379741099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624650049 + 365497924 = 24993^2 + 19118^2 .

It is a cyclic number.

It is not a de Polignac number, because 990147973 - 2⁵ = 990147941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990147943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495073986 + 495073987.

It is an arithmetic number, because the mean of its divisors is an integer number (495073987).

Almost surely, 2^990147973 is an apocalyptic number.

It is an amenable number.

990147973 is a deficient number, since it is larger than the sum of its proper divisors (1).

990147973 is an equidigital number, since it uses as much as digits as its factorization.

990147973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 990147973 is about 31466.6168025735. The cubic root of 990147973 is about 996.7051468659.

The spelling of 990147973 in words is "nine hundred ninety million, one hundred forty-seven thousand, nine hundred seventy-three".