142161561 has 16 divisors (see below), whose sum is σ = 213213120. Its totient is φ = 94772916.

The previous prime is 142161559. The next prime is 142161577. The reversal of 142161561 is 165161241.

142161561 is a `hidden beast` number, since 1 + 42 + 1 + 61 + 561 = 666.

142161561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142161561 - 2¹ = 142161559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (142161541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30315 + ... + 34688.

It is an arithmetic number, because the mean of its divisors is an integer number (13325820).

Almost surely, 2^142161561 is an apocalyptic number.

It is an amenable number.

142161561 is a deficient number, since it is larger than the sum of its proper divisors (71051559).

142161561 is an frugal number, since it uses more digits than its factorization.

142161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65024 (or 65006 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 142161561 is about 11923.1523096872. The cubic root of 142161561 is about 521.9081288972.

The spelling of 142161561 in words is "one hundred forty-two million, one hundred sixty-one thousand, five hundred sixty-one".