691386869041 has 4 divisors (see below), whose sum is σ = 754240220784. Its totient is φ = 628533517300.

The previous prime is 691386869027. The next prime is 691386869081. The reversal of 691386869041 is 140968683196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691386869041 - 2¹³ = 691386860849 is a prime.

It is a super-3 number, since 3×691386869041³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691386869081) 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, 31426675855 + ... + 31426675876.

It is an arithmetic number, because the mean of its divisors is an integer number (188560055196).

Almost surely, 2^691386869041 is an apocalyptic number.

It is an amenable number.

691386869041 is a deficient number, since it is larger than the sum of its proper divisors (62853351743).

691386869041 is a wasteful number, since it uses less digits than its factorization.

691386869041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62853351742.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 691386869041 in words is "six hundred ninety-one billion, three hundred eighty-six million, eight hundred sixty-nine thousand, forty-one".