161187538 has 16 divisors (see below), whose sum is σ = 250016256. Its totient is φ = 77857920.

The previous prime is 161187529. The next prime is 161187541. The reversal of 161187538 is 835781161.

161187538 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161187538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39795 + ... + 43657.

It is an arithmetic number, because the mean of its divisors is an integer number (15626016).

Almost surely, 2^161187538 is an apocalyptic number.

161187538 is a deficient number, since it is larger than the sum of its proper divisors (88828718).

161187538 is a wasteful number, since it uses less digits than its factorization.

161187538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569.

The product of its digits is 40320, while the sum is 40.

The square root of 161187538 is about 12695.9654221331. The cubic root of 161187538 is about 544.2233282332.

The spelling of 161187538 in words is "one hundred sixty-one million, one hundred eighty-seven thousand, five hundred thirty-eight".