161387541 has 24 divisors (see below), whose sum is σ = 267306624. Its totient is φ = 91913760.

The previous prime is 161387509. The next prime is 161387549. The reversal of 161387541 is 145783161.

It is not a de Polignac number, because 161387541 - 2⁵ = 161387509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161387496 and 161387505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161387549) 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 23 ways as a sum of consecutive naturals, for example, 15475 + ... + 23711.

It is an arithmetic number, because the mean of its divisors is an integer number (11137776).

Almost surely, 2^161387541 is an apocalyptic number.

It is an amenable number.

161387541 is a deficient number, since it is larger than the sum of its proper divisors (105919083).

161387541 is a wasteful number, since it uses less digits than its factorization.

161387541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8561 (or 8558 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 161387541 is about 12703.8396164309. The cubic root of 161387541 is about 544.4483276583.

The spelling of 161387541 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, five hundred forty-one".