990879513 has 16 divisors (see below), whose sum is σ = 1457506176. Its totient is φ = 594898560.

The previous prime is 990879509. The next prime is 990879517. The reversal of 990879513 is 315978099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990879509) and next prime (990879517).

It is not a de Polignac number, because 990879513 - 2² = 990879509 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (990879517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308245 + ... + 311442.

It is an arithmetic number, because the mean of its divisors is an integer number (91094136).

Almost surely, 2^990879513 is an apocalyptic number.

It is an amenable number.

990879513 is a deficient number, since it is larger than the sum of its proper divisors (466626663).

990879513 is a wasteful number, since it uses less digits than its factorization.

990879513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619744.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 990879513 is about 31478.2387213770. The cubic root of 990879513 is about 996.9505479614.

The spelling of 990879513 in words is "nine hundred ninety million, eight hundred seventy-nine thousand, five hundred thirteen".