691913093390 has 32 divisors (see below), whose sum is σ = 1260760134816. Its totient is φ = 273363203200.

The previous prime is 691913093363. The next prime is 691913093393. The reversal of 691913093390 is 93390319196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691913093393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3329540 + ... + 3531240.

It is an arithmetic number, because the mean of its divisors is an integer number (39398754213).

Almost surely, 2^691913093390 is an apocalyptic number.

691913093390 is a deficient number, since it is larger than the sum of its proper divisors (568847041426).

691913093390 is a wasteful number, since it uses less digits than its factorization.

691913093390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205924.

The product of its (nonzero) digits is 1062882, while the sum is 53.

The spelling of 691913093390 in words is "six hundred ninety-one billion, nine hundred thirteen million, ninety-three thousand, three hundred ninety".