691761541 has 2 divisors, whose sum is σ = 691761542. Its totient is φ = 691761540.

The previous prime is 691761529. The next prime is 691761599. The reversal of 691761541 is 145167196.

691761541 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., 550840900 + 140920641 = 23470^2 + 11871^2 .

It is a cyclic number.

It is not a de Polignac number, because 691761541 - 2²³ = 683372933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691761494 and 691761503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691761341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345880770 + 345880771.

It is an arithmetic number, because the mean of its divisors is an integer number (345880771).

Almost surely, 2^691761541 is an apocalyptic number.

It is an amenable number.

691761541 is a deficient number, since it is larger than the sum of its proper divisors (1).

691761541 is an equidigital number, since it uses as much as digits as its factorization.

691761541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 691761541 is about 26301.3600598904. The cubic root of 691761541 is about 884.4069317525.

The spelling of 691761541 in words is "six hundred ninety-one million, seven hundred sixty-one thousand, five hundred forty-one".