989941523 has 4 divisors (see below), whose sum is σ = 991243128. Its totient is φ = 988639920.

The previous prime is 989941499. The next prime is 989941541. The reversal of 989941523 is 325149989.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989941523 - 2²² = 985747219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989949523) 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, 649661 + ... + 651182.

It is an arithmetic number, because the mean of its divisors is an integer number (247810782).

Almost surely, 2^989941523 is an apocalyptic number.

989941523 is a deficient number, since it is larger than the sum of its proper divisors (1301605).

989941523 is a wasteful number, since it uses less digits than its factorization.

989941523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301604.

The product of its digits is 699840, while the sum is 50.

The square root of 989941523 is about 31463.3361708513. The cubic root of 989941523 is about 996.6358696514.

The spelling of 989941523 in words is "nine hundred eighty-nine million, nine hundred forty-one thousand, five hundred twenty-three".