161528535 has 48 divisors (see below), whose sum is σ = 324080640. Its totient is φ = 72895680.

The previous prime is 161528533. The next prime is 161528567. The reversal of 161528535 is 535825161.

It is a happy number.

161528535 is a `hidden beast` number, since 1 + 615 + 2 + 8 + 5 + 35 = 666.

It is not a de Polignac number, because 161528535 - 2¹ = 161528533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161528535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161528533) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21640 + ... + 28130.

It is an arithmetic number, because the mean of its divisors is an integer number (6751680).

Almost surely, 2^161528535 is an apocalyptic number.

161528535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161528535 is an abundant number, since it is smaller than the sum of its proper divisors (162552105).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161528535 is a wasteful number, since it uses less digits than its factorization.

161528535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6588 (or 6585 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 161528535 is about 12709.3876721107. The cubic root of 161528535 is about 544.6068314339.

The spelling of 161528535 in words is "one hundred sixty-one million, five hundred twenty-eight thousand, five hundred thirty-five".