990438971 has 2 divisors, whose sum is σ = 990438972. Its totient is φ = 990438970.

The previous prime is 990438941. The next prime is 990438979. The reversal of 990438971 is 179834099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990438971 - 2²² = 986244667 is a prime.

It is a super-3 number, since 3×990438971³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (990438979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495219485 + 495219486.

It is an arithmetic number, because the mean of its divisors is an integer number (495219486).

Almost surely, 2^990438971 is an apocalyptic number.

990438971 is a deficient number, since it is larger than the sum of its proper divisors (1).

990438971 is an equidigital number, since it uses as much as digits as its factorization.

990438971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 990438971 is about 31471.2403791144. The cubic root of 990438971 is about 996.8027790055.

The spelling of 990438971 in words is "nine hundred ninety million, four hundred thirty-eight thousand, nine hundred seventy-one".