990719009279 has 4 divisors (see below), whose sum is σ = 1011798137184. Its totient is φ = 969639881376.

The previous prime is 990719009239. The next prime is 990719009309. The reversal of 990719009279 is 972900917099.

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 990719009279 - 2¹² = 990719005183 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 (990719009239) 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, 10539563882 + ... + 10539563975.

It is an arithmetic number, because the mean of its divisors is an integer number (252949534296).

Almost surely, 2^990719009279 is an apocalyptic number.

990719009279 is a deficient number, since it is larger than the sum of its proper divisors (21079127905).

990719009279 is a wasteful number, since it uses less digits than its factorization.

990719009279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21079127904.

The product of its (nonzero) digits is 5786802, while the sum is 62.

The spelling of 990719009279 in words is "nine hundred ninety billion, seven hundred nineteen million, nine thousand, two hundred seventy-nine".