691026909139 has 8 divisors (see below), whose sum is σ = 800563464800. Its totient is φ = 584194959936.

The previous prime is 691026909119. The next prime is 691026909179. The reversal of 691026909139 is 931909620196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691026909139 - 2⁵ = 691026909107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691026909139.

It is not an unprimeable number, because it can be changed into a prime (691026909109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676151064 + ... + 676152085.

It is an arithmetic number, because the mean of its divisors is an integer number (100070433100).

Almost surely, 2^691026909139 is an apocalyptic number.

691026909139 is a deficient number, since it is larger than the sum of its proper divisors (109536555661).

691026909139 is a wasteful number, since it uses less digits than its factorization.

691026909139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352303229.

The product of its (nonzero) digits is 1417176, while the sum is 55.

The spelling of 691026909139 in words is "six hundred ninety-one billion, twenty-six million, nine hundred nine thousand, one hundred thirty-nine".