161742529 has 8 divisors (see below), whose sum is σ = 174486312. Its totient is φ = 149041920.

The previous prime is 161742527. The next prime is 161742547. The reversal of 161742529 is 925247161.

It can be written as a sum of positive squares in 4 ways, for example, as 10575504 + 151167025 = 3252^2 + 12295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161742529 - 2¹ = 161742527 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161742521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2782 + ... + 18199.

It is an arithmetic number, because the mean of its divisors is an integer number (21810789).

Almost surely, 2^161742529 is an apocalyptic number.

It is an amenable number.

161742529 is a deficient number, since it is larger than the sum of its proper divisors (12743783).

161742529 is a wasteful number, since it uses less digits than its factorization.

161742529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21587.

The product of its digits is 30240, while the sum is 37.

The square root of 161742529 is about 12717.8036232677. The cubic root of 161742529 is about 544.8472248040.

The spelling of 161742529 in words is "one hundred sixty-one million, seven hundred forty-two thousand, five hundred twenty-nine".