990129279 has 4 divisors (see below), whose sum is σ = 1320172376. Its totient is φ = 660086184.

The previous prime is 990129269. The next prime is 990129299. The reversal of 990129279 is 972921099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972921099 = 3 ⋅324307033.

It is not a de Polignac number, because 990129279 - 2¹⁶ = 990063743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990129229) 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, 165021544 + ... + 165021549.

It is an arithmetic number, because the mean of its divisors is an integer number (330043094).

Almost surely, 2^990129279 is an apocalyptic number.

990129279 is a deficient number, since it is larger than the sum of its proper divisors (330043097).

990129279 is a wasteful number, since it uses less digits than its factorization.

990129279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330043096.

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 990129279 is about 31466.3197562092. The cubic root of 990129279 is about 996.6988742266.

The spelling of 990129279 in words is "nine hundred ninety million, one hundred twenty-nine thousand, two hundred seventy-nine".