989902523 has 2 divisors, whose sum is σ = 989902524. Its totient is φ = 989902522.

The previous prime is 989902493. The next prime is 989902541. The reversal of 989902523 is 325209989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989902523 is a prime.

It is not a weakly prime, because it can be changed into another prime (989802523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494951261 + 494951262.

It is an arithmetic number, because the mean of its divisors is an integer number (494951262).

Almost surely, 2^989902523 is an apocalyptic number.

989902523 is a deficient number, since it is larger than the sum of its proper divisors (1).

989902523 is an equidigital number, since it uses as much as digits as its factorization.

989902523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 989902523 is about 31462.7163957596. The cubic root of 989902523 is about 996.6227815687.

The spelling of 989902523 in words is "nine hundred eighty-nine million, nine hundred two thousand, five hundred twenty-three".