168507541 has 2 divisors, whose sum is σ = 168507542. Its totient is φ = 168507540.

The previous prime is 168507517. The next prime is 168507611. The reversal of 168507541 is 145705861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 55935441 = 10610^2 + 7479^2 .

It is a cyclic number.

It is not a de Polignac number, because 168507541 - 2¹⁵ = 168474773 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168507541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168507341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84253770 + 84253771.

It is an arithmetic number, because the mean of its divisors is an integer number (84253771).

Almost surely, 2^168507541 is an apocalyptic number.

It is an amenable number.

168507541 is a deficient number, since it is larger than the sum of its proper divisors (1).

168507541 is an equidigital number, since it uses as much as digits as its factorization.

168507541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 168507541 is about 12981.0454509643. The cubic root of 168507541 is about 552.3399382096.

The spelling of 168507541 in words is "one hundred sixty-eight million, five hundred seven thousand, five hundred forty-one".