168962561 has 2 divisors, whose sum is σ = 168962562. Its totient is φ = 168962560.

The previous prime is 168962537. The next prime is 168962653. The reversal of 168962561 is 165269861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 43970161 = 11180^2 + 6631^2 .

It is a cyclic number.

It is not a de Polignac number, because 168962561 - 2¹⁰ = 168961537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (168962501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84481280 + 84481281.

It is an arithmetic number, because the mean of its divisors is an integer number (84481281).

Almost surely, 2^168962561 is an apocalyptic number.

It is an amenable number.

168962561 is a deficient number, since it is larger than the sum of its proper divisors (1).

168962561 is an equidigital number, since it uses as much as digits as its factorization.

168962561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 168962561 is about 12998.5599587031. The cubic root of 168962561 is about 552.8366515676.

The spelling of 168962561 in words is "one hundred sixty-eight million, nine hundred sixty-two thousand, five hundred sixty-one".