161252141 has 4 divisors (see below), whose sum is σ = 161730972. Its totient is φ = 160773312.

The previous prime is 161252099. The next prime is 161252171. The reversal of 161252141 is 141252161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91278916 + 69973225 = 9554^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 161252141 - 2¹⁰ = 161251117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161252171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238910 + ... + 239583.

It is an arithmetic number, because the mean of its divisors is an integer number (40432743).

Almost surely, 2^161252141 is an apocalyptic number.

It is an amenable number.

161252141 is a deficient number, since it is larger than the sum of its proper divisors (478831).

161252141 is an equidigital number, since it uses as much as digits as its factorization.

161252141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478830.

The product of its digits is 480, while the sum is 23.

The square root of 161252141 is about 12698.5094007131. The cubic root of 161252141 is about 544.2960256722.

The spelling of 161252141 in words is "one hundred sixty-one million, two hundred fifty-two thousand, one hundred forty-one".