990415901 has 2 divisors, whose sum is σ = 990415902. Its totient is φ = 990415900.

The previous prime is 990415897. The next prime is 990415957. The reversal of 990415901 is 109514099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922336900 + 68079001 = 30370^2 + 8251^2 .

It is a cyclic number.

It is not a de Polignac number, because 990415901 - 2² = 990415897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990415961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495207950 + 495207951.

It is an arithmetic number, because the mean of its divisors is an integer number (495207951).

Almost surely, 2^990415901 is an apocalyptic number.

It is an amenable number.

990415901 is a deficient number, since it is larger than the sum of its proper divisors (1).

990415901 is an equidigital number, since it uses as much as digits as its factorization.

990415901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 990415901 is about 31470.8738518650. The cubic root of 990415901 is about 996.7950395353.

The spelling of 990415901 in words is "nine hundred ninety million, four hundred fifteen thousand, nine hundred one".