161157542 has 24 divisors (see below), whose sum is σ = 297838128. Its totient is φ = 63686880.

The previous prime is 161157523. The next prime is 161157559. The reversal of 161157542 is 245751161.

It is a junction number, because it is equal to n+sod(n) for n = 161157499 and 161157508.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 170792 + ... + 171732.

It is an arithmetic number, because the mean of its divisors is an integer number (12409922).

Almost surely, 2^161157542 is an apocalyptic number.

161157542 is a deficient number, since it is larger than the sum of its proper divisors (136680586).

161157542 is an frugal number, since it uses more digits than its factorization.

161157542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 963 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 161157542 is about 12694.7840470014. The cubic root of 161157542 is about 544.1895672781.

The spelling of 161157542 in words is "one hundred sixty-one million, one hundred fifty-seven thousand, five hundred forty-two".