990415117 has 2 divisors, whose sum is σ = 990415118. Its totient is φ = 990415116.

The previous prime is 990415091. The next prime is 990415133. The reversal of 990415117 is 711514099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616727556 + 373687561 = 24834^2 + 19331^2 .

It is a cyclic number.

It is not a de Polignac number, because 990415117 - 2²⁷ = 856197389 is a prime.

It is equal to p_50384764 and since 990415117 and 50384764 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990445117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495207558 + 495207559.

It is an arithmetic number, because the mean of its divisors is an integer number (495207559).

Almost surely, 2^990415117 is an apocalyptic number.

It is an amenable number.

990415117 is a deficient number, since it is larger than the sum of its proper divisors (1).

990415117 is an equidigital number, since it uses as much as digits as its factorization.

990415117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 990415117 is about 31470.8613959008. The cubic root of 990415117 is about 996.7947765187.

The spelling of 990415117 in words is "nine hundred ninety million, four hundred fifteen thousand, one hundred seventeen".