231535541 has 2 divisors, whose sum is σ = 231535542. Its totient is φ = 231535540.

The previous prime is 231535537. The next prime is 231535543. The reversal of 231535541 is 145535132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116424100 + 115111441 = 10790^2 + 10729^2 .

It is a cyclic number.

It is not a de Polignac number, because 231535541 - 2² = 231535537 is a prime.

Together with 231535543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231535543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115767770 + 115767771.

It is an arithmetic number, because the mean of its divisors is an integer number (115767771).

Almost surely, 2^231535541 is an apocalyptic number.

It is an amenable number.

231535541 is a deficient number, since it is larger than the sum of its proper divisors (1).

231535541 is an equidigital number, since it uses as much as digits as its factorization.

231535541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 29.

The square root of 231535541 is about 15216.2919596070. The cubic root of 231535541 is about 614.0530437256.

The spelling of 231535541 in words is "two hundred thirty-one million, five hundred thirty-five thousand, five hundred forty-one".