691316541 has 6 divisors (see below), whose sum is σ = 998568350. Its totient is φ = 460877688.

The previous prime is 691316531. The next prime is 691316551. The reversal of 691316541 is 145613196.

It is an interprime number because it is at equal distance from previous prime (691316531) and next prime (691316551).

It can be written as a sum of positive squares in only one way, i.e., 488852100 + 202464441 = 22110^2 + 14229^2 .

It is not a de Polignac number, because 691316541 - 2¹⁴ = 691300157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691316496 and 691316505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691316531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38406466 + ... + 38406483.

Almost surely, 2^691316541 is an apocalyptic number.

It is an amenable number.

691316541 is a deficient number, since it is larger than the sum of its proper divisors (307251809).

691316541 is a wasteful number, since it uses less digits than its factorization.

691316541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76812955 (or 76812952 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 691316541 is about 26292.8990603927. The cubic root of 691316541 is about 884.2172490935.

The spelling of 691316541 in words is "six hundred ninety-one million, three hundred sixteen thousand, five hundred forty-one".