990203831 has 2 divisors, whose sum is σ = 990203832. Its totient is φ = 990203830.

The previous prime is 990203827. The next prime is 990203857. The reversal of 990203831 is 138302099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990203831 - 2² = 990203827 is a prime.

It is a super-2 number, since 2×990203831² = 1961007253854153122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 990203791 and 990203800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990203821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495101915 + 495101916.

It is an arithmetic number, because the mean of its divisors is an integer number (495101916).

Almost surely, 2^990203831 is an apocalyptic number.

990203831 is a deficient number, since it is larger than the sum of its proper divisors (1).

990203831 is an equidigital number, since it uses as much as digits as its factorization.

990203831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 990203831 is about 31467.5043656150. The cubic root of 990203831 is about 996.7238891518.

The spelling of 990203831 in words is "nine hundred ninety million, two hundred three thousand, eight hundred thirty-one".