1601015989 has 2 divisors, whose sum is σ = 1601015990. Its totient is φ = 1601015988.

The previous prime is 1601015959. The next prime is 1601016007. The reversal of 1601015989 is 9895101061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1016972100 + 584043889 = 31890^2 + 24167^2 .

It is an emirp because it is prime and its reverse (9895101061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601015989 - 2²³ = 1592627381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601015959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800507994 + 800507995.

It is an arithmetic number, because the mean of its divisors is an integer number (800507995).

Almost surely, 2^1601015989 is an apocalyptic number.

It is an amenable number.

1601015989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601015989 is an equidigital number, since it uses as much as digits as its factorization.

1601015989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 1601015989 is about 40012.6978470585. The cubic root of 1601015989 is about 1169.8546070579.

The spelling of 1601015989 in words is "one billion, six hundred one million, fifteen thousand, nine hundred eighty-nine".