691281253113 has 16 divisors (see below), whose sum is σ = 1014897206016. Its totient is φ = 415042834640.

The previous prime is 691281253109. The next prime is 691281253127. The reversal of 691281253113 is 311352182196.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 691281253113 - 2² = 691281253109 is a prime.

It is a super-3 number, since 3×691281253113³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (691281253133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97883931 + ... + 97890992.

It is an arithmetic number, because the mean of its divisors is an integer number (63431075376).

Almost surely, 2^691281253113 is an apocalyptic number.

It is an amenable number.

691281253113 is a deficient number, since it is larger than the sum of its proper divisors (323615952903).

691281253113 is a wasteful number, since it uses less digits than its factorization.

691281253113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195775044.

The product of its digits is 77760, while the sum is 42.

The spelling of 691281253113 in words is "six hundred ninety-one billion, two hundred eighty-one million, two hundred fifty-three thousand, one hundred thirteen".