691319440597 has 2 divisors, whose sum is σ = 691319440598. Its totient is φ = 691319440596.

The previous prime is 691319440577. The next prime is 691319440631. The reversal of 691319440597 is 795044913196.

691319440597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688923240196 + 2396200401 = 830014^2 + 48951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691319440597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691319440577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345659720298 + 345659720299.

It is an arithmetic number, because the mean of its divisors is an integer number (345659720299).

Almost surely, 2^691319440597 is an apocalyptic number.

It is an amenable number.

691319440597 is a deficient number, since it is larger than the sum of its proper divisors (1).

691319440597 is an equidigital number, since it uses as much as digits as its factorization.

691319440597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 58.

The spelling of 691319440597 in words is "six hundred ninety-one billion, three hundred nineteen million, four hundred forty thousand, five hundred ninety-seven".