1990814317 has 4 divisors (see below), whose sum is σ = 2018085820. Its totient is φ = 1963542816.

The previous prime is 1990814269. The next prime is 1990814321. The reversal of 1990814317 is 7134180991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7134180991 = 7 ⋅1019168713.

It can be written as a sum of positive squares in 2 ways, for example, as 1452295881 + 538518436 = 38109^2 + 23206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990814317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990814377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13635642 + ... + 13635787.

It is an arithmetic number, because the mean of its divisors is an integer number (504521455).

Almost surely, 2^1990814317 is an apocalyptic number.

It is an amenable number.

1990814317 is a deficient number, since it is larger than the sum of its proper divisors (27271503).

1990814317 is an equidigital number, since it uses as much as digits as its factorization.

1990814317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27271502.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1990814317 is about 44618.5423002590. The cubic root of 1990814317 is about 1257.9892167734.

It can be divided in two parts, 19908 and 14317, that added together give a square (34225 = 185²).

The spelling of 1990814317 in words is "one billion, nine hundred ninety million, eight hundred fourteen thousand, three hundred seventeen".