161602121 has 16 divisors (see below), whose sum is σ = 169793280. Its totient is φ = 153676800.

The previous prime is 161602093. The next prime is 161602169. The reversal of 161602121 is 121206161.

It is a cyclic number.

It is not a de Polignac number, because 161602121 - 2¹⁴ = 161585737 is a prime.

It is a super-2 number, since 2×161602121² = 52230491023397282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161602093 and 161602102.

It is not an unprimeable number, because it can be changed into a prime (161602171) 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 15 ways as a sum of consecutive naturals, for example, 279785 + ... + 280361.

It is an arithmetic number, because the mean of its divisors is an integer number (10612080).

Almost surely, 2^161602121 is an apocalyptic number.

It is an amenable number.

161602121 is a deficient number, since it is larger than the sum of its proper divisors (8191159).

161602121 is a wasteful number, since it uses less digits than its factorization.

161602121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 161602121 is about 12712.2822891879. The cubic root of 161602121 is about 544.6895193096.

Adding to 161602121 its reverse (121206161), we get a palindrome (282808282).

It can be divided in two parts, 1616021 and 21, that multiplied together give a triangular number (33936441 = T₈₂₃₈).

The spelling of 161602121 in words is "one hundred sixty-one million, six hundred two thousand, one hundred twenty-one".