161345541 has 16 divisors (see below), whose sum is σ = 246775808. Its totient is φ = 91854000.

The previous prime is 161345539. The next prime is 161345543. The reversal of 161345541 is 145543161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161345539) and next prime (161345543).

It is not a de Polignac number, because 161345541 - 2¹ = 161345539 is a prime.

It is a super-4 number, since 4×161345541⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161345499 and 161345508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161345543) 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, 8485 + ... + 19866.

It is an arithmetic number, because the mean of its divisors is an integer number (15423488).

Almost surely, 2^161345541 is an apocalyptic number.

It is an amenable number.

161345541 is a deficient number, since it is larger than the sum of its proper divisors (85430267).

161345541 is a wasteful number, since it uses less digits than its factorization.

161345541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28632.

The product of its digits is 7200, while the sum is 30.

The square root of 161345541 is about 12702.1864653295. The cubic root of 161345541 is about 544.4010939137.

The spelling of 161345541 in words is "one hundred sixty-one million, three hundred forty-five thousand, five hundred forty-one".