1490871509 has 2 divisors, whose sum is σ = 1490871510. Its totient is φ = 1490871508.

The previous prime is 1490871467. The next prime is 1490871511. The reversal of 1490871509 is 9051780941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239744100 + 251127409 = 35210^2 + 15847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1490871509 is a prime.

It is a Sophie Germain prime.

Together with 1490871511, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1490871509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1490871709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745435754 + 745435755.

It is an arithmetic number, because the mean of its divisors is an integer number (745435755).

Almost surely, 2^1490871509 is an apocalyptic number.

It is an amenable number.

1490871509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1490871509 is an equidigital number, since it uses as much as digits as its factorization.

1490871509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1490871509 is about 38611.8053061496. The cubic root of 1490871509 is about 1142.3874018827.

The spelling of 1490871509 in words is "one billion, four hundred ninety million, eight hundred seventy-one thousand, five hundred nine".