42742161 has 90 divisors (see below), whose sum is σ = 82557090. Its totient is φ = 21954240.

The previous prime is 42742127. The next prime is 42742169. The reversal of 42742161 is 16124724.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 12006225 = 5544^2 + 3465^2 .

It is not a de Polignac number, because 42742161 - 2¹³ = 42733969 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 (42742169) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 480205 + ... + 480293.

It is an arithmetic number, because the mean of its divisors is an integer number (917301).

Almost surely, 2^42742161 is an apocalyptic number.

It is an amenable number.

42742161 is a deficient number, since it is larger than the sum of its proper divisors (39814929).

42742161 is a wasteful number, since it uses less digits than its factorization.

42742161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 110 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 42742161 is about 6537.7489245152. The cubic root of 42742161 is about 349.6381593804.

Adding to 42742161 its reverse (16124724), we get a palindrome (58866885).

The spelling of 42742161 in words is "forty-two million, seven hundred forty-two thousand, one hundred sixty-one".