1490491771 has 2 divisors, whose sum is σ = 1490491772. Its totient is φ = 1490491770.

The previous prime is 1490491763. The next prime is 1490491781. The reversal of 1490491771 is 1771940941.

It is a weak prime.

It is an emirp because it is prime and its reverse (1771940941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1490491771 - 2³ = 1490491763 is a prime.

It is not a weakly prime, because it can be changed into another prime (1490491781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745245885 + 745245886.

It is an arithmetic number, because the mean of its divisors is an integer number (745245886).

Almost surely, 2^1490491771 is an apocalyptic number.

1490491771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1490491771 is an equidigital number, since it uses as much as digits as its factorization.

1490491771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 1490491771 is about 38606.8876108914. The cubic root of 1490491771 is about 1142.2904016290.

The spelling of 1490491771 in words is "one billion, four hundred ninety million, four hundred ninety-one thousand, seven hundred seventy-one".