1038889661 has 4 divisors (see below), whose sum is σ = 1040955552. Its totient is φ = 1036823772.

The previous prime is 1038889651. The next prime is 1038889667. The reversal of 1038889661 is 1669888301.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1669888301 = 37159 ⋅44939.

It is a cyclic number.

It is not a de Polignac number, because 1038889661 - 2¹⁰ = 1038888637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1038889667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032191 + ... + 1033196.

It is an arithmetic number, because the mean of its divisors is an integer number (260238888).

Almost surely, 2^1038889661 is an apocalyptic number.

It is an amenable number.

1038889661 is a deficient number, since it is larger than the sum of its proper divisors (2065891).

1038889661 is an equidigital number, since it uses as much as digits as its factorization.

1038889661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065890.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 1038889661 is about 32231.8113204952. The cubic root of 1038889661 is about 1012.7987144029.

The spelling of 1038889661 in words is "one billion, thirty-eight million, eight hundred eighty-nine thousand, six hundred sixty-one".