989870641 has 4 divisors (see below), whose sum is σ = 1021801984. Its totient is φ = 957939300.

The previous prime is 989870597. The next prime is 989870647. The reversal of 989870641 is 146078989.

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.

It is a cyclic number.

It is not a de Polignac number, because 989870641 - 2⁷ = 989870513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989870647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15965625 + ... + 15965686.

It is an arithmetic number, because the mean of its divisors is an integer number (255450496).

Almost surely, 2^989870641 is an apocalyptic number.

It is an amenable number.

989870641 is a deficient number, since it is larger than the sum of its proper divisors (31931343).

989870641 is a wasteful number, since it uses less digits than its factorization.

989870641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31931342.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 989870641 is about 31462.2097284981. The cubic root of 989870641 is about 996.6120819736.

The spelling of 989870641 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, six hundred forty-one".