161240142 has 16 divisors (see below), whose sum is σ = 368548992. Its totient is φ = 46068600.

The previous prime is 161240129. The next prime is 161240147. The reversal of 161240142 is 241042161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161240147) 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, 1919484 + ... + 1919567.

It is an arithmetic number, because the mean of its divisors is an integer number (23034312).

Almost surely, 2^161240142 is an apocalyptic number.

161240142 is an abundant number, since it is smaller than the sum of its proper divisors (207308850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161240142 is a wasteful number, since it uses less digits than its factorization.

161240142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839063.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 161240142 is about 12698.0369348967. The cubic root of 161240142 is about 544.2825247248.

The spelling of 161240142 in words is "one hundred sixty-one million, two hundred forty thousand, one hundred forty-two".