161528761 has 2 divisors, whose sum is σ = 161528762. Its totient is φ = 161528760.

The previous prime is 161528743. The next prime is 161528803. The reversal of 161528761 is 167825161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115885225 + 45643536 = 10765^2 + 6756^2 .

It is a cyclic number.

It is not a de Polignac number, because 161528761 - 2⁹ = 161528249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161528761.

It is not a weakly prime, because it can be changed into another prime (161528711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80764380 + 80764381.

It is an arithmetic number, because the mean of its divisors is an integer number (80764381).

Almost surely, 2^161528761 is an apocalyptic number.

It is an amenable number.

161528761 is a deficient number, since it is larger than the sum of its proper divisors (1).

161528761 is an equidigital number, since it uses as much as digits as its factorization.

161528761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 161528761 is about 12709.3965631732. The cubic root of 161528761 is about 544.6070854264.

The spelling of 161528761 in words is "one hundred sixty-one million, five hundred twenty-eight thousand, seven hundred sixty-one".