1499715661 has 2 divisors, whose sum is σ = 1499715662. Its totient is φ = 1499715660.

The previous prime is 1499715617. The next prime is 1499715703. The reversal of 1499715661 is 1665179941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1382426761 + 117288900 = 37181^2 + 10830^2 .

It is an emirp because it is prime and its reverse (1665179941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1499715661 - 2⁹ = 1499715149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1499715361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 749857830 + 749857831.

It is an arithmetic number, because the mean of its divisors is an integer number (749857831).

Almost surely, 2^1499715661 is an apocalyptic number.

It is an amenable number.

1499715661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1499715661 is an equidigital number, since it uses as much as digits as its factorization.

1499715661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 49.

The square root of 1499715661 is about 38726.1624873935. The cubic root of 1499715661 is about 1144.6419075597.

The spelling of 1499715661 in words is "one billion, four hundred ninety-nine million, seven hundred fifteen thousand, six hundred sixty-one".