161387542 has 16 divisors (see below), whose sum is σ = 243893520. Its totient is φ = 80092512.

The previous prime is 161387509. The next prime is 161387549. The reversal of 161387542 is 245783161.

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 7 ways as a sum of consecutive naturals, for example, 219808 + ... + 220540.

It is an arithmetic number, because the mean of its divisors is an integer number (15243345).

Almost surely, 2^161387542 is an apocalyptic number.

161387542 is a deficient number, since it is larger than the sum of its proper divisors (82505978).

161387542 is a wasteful number, since it uses less digits than its factorization.

161387542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its digits is 40320, while the sum is 37.

The square root of 161387542 is about 12703.8396557891. The cubic root of 161387542 is about 544.4483287828.

The spelling of 161387542 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, five hundred forty-two".