1279690089 has 16 divisors (see below), whose sum is σ = 1714195200. Its totient is φ = 849166416.

The previous prime is 1279690067. The next prime is 1279690121. The reversal of 1279690089 is 9800969721.

It is a happy number.

It is not a de Polignac number, because 1279690089 - 2¹⁶ = 1279624553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1279690189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839482 + ... + 841004.

It is an arithmetic number, because the mean of its divisors is an integer number (107137200).

Almost surely, 2^1279690089 is an apocalyptic number.

It is an amenable number.

1279690089 is a deficient number, since it is larger than the sum of its proper divisors (434505111).

1279690089 is a wasteful number, since it uses less digits than its factorization.

1279690089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644.

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 1279690089 is about 35772.7562399097. The cubic root of 1279690089 is about 1085.6794116610.

The spelling of 1279690089 in words is "one billion, two hundred seventy-nine million, six hundred ninety thousand, eighty-nine".