1536989 has 2 divisors, whose sum is σ = 1536990. Its totient is φ = 1536988.

The previous prime is 1536961. The next prime is 1536991. The reversal of 1536989 is 9896351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 293764 = 1115^2 + 542^2 .

It is an emirp because it is prime and its reverse (9896351) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1536989 is a prime.

It is a super-2 number, since 2×1536989² = 4724670372242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1536991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1536959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768494 + 768495.

It is an arithmetic number, because the mean of its divisors is an integer number (768495).

2^1536989 is an apocalyptic number.

It is an amenable number.

1536989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1536989 is an equidigital number, since it uses as much as digits as its factorization.

1536989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 1536989 is about 1239.7536045521. The cubic root of 1536989 is about 115.4047239370.

The spelling of 1536989 in words is "one million, five hundred thirty-six thousand, nine hundred eighty-nine".