989902513 has 4 divisors (see below), whose sum is σ = 989966628. Its totient is φ = 989838400.

The previous prime is 989902493. The next prime is 989902523. The reversal of 989902513 is 315209989.

989902513 = 22247² + 22248².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 315209989 = 647 ⋅487187.

It can be written as a sum of positive squares in 2 ways, for example, as 494929009 + 494973504 = 22247^2 + 22248^2 .

It is a cyclic number.

It is not a de Polignac number, because 989902513 - 2⁵ = 989902481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989902523) 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, 6813 + ... + 45013.

It is an arithmetic number, because the mean of its divisors is an integer number (247491657).

Almost surely, 2^989902513 is an apocalyptic number.

989902513 is the 22248-th centered square number.

It is an amenable number.

989902513 is a deficient number, since it is larger than the sum of its proper divisors (64115).

989902513 is a wasteful number, since it uses less digits than its factorization.

989902513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64114.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 989902513 is about 31462.7162368413. The cubic root of 989902513 is about 996.6227782128.

The spelling of 989902513 in words is "nine hundred eighty-nine million, nine hundred two thousand, five hundred thirteen".