161055381 has 16 divisors (see below), whose sum is σ = 226688000. Its totient is φ = 101428848.

The previous prime is 161055373. The next prime is 161055383. The reversal of 161055381 is 183550161.

It is not a de Polignac number, because 161055381 - 2³ = 161055373 is a prime.

It is a super-2 number, since 2×161055381² = 51877671498110322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161055383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17070 + ... + 24768.

It is an arithmetic number, because the mean of its divisors is an integer number (14168000).

Almost surely, 2^161055381 is an apocalyptic number.

It is an amenable number.

161055381 is a deficient number, since it is larger than the sum of its proper divisors (65632619).

161055381 is a wasteful number, since it uses less digits than its factorization.

161055381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8088.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 161055381 is about 12690.7596699331. The cubic root of 161055381 is about 544.0745520753.

The spelling of 161055381 in words is "one hundred sixty-one million, fifty-five thousand, three hundred eighty-one".