42115145 has 4 divisors (see below), whose sum is σ = 50538180. Its totient is φ = 33692112.

The previous prime is 42115133. The next prime is 42115147. The reversal of 42115145 is 54151124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4892944 + 37222201 = 2212^2 + 6101^2 .

It is a cyclic number.

It is not a de Polignac number, because 42115145 - 2¹⁸ = 41853001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42115145.

It is not an unprimeable number, because it can be changed into a prime (42115147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4211510 + ... + 4211519.

It is an arithmetic number, because the mean of its divisors is an integer number (12634545).

Almost surely, 2^42115145 is an apocalyptic number.

It is an amenable number.

42115145 is a deficient number, since it is larger than the sum of its proper divisors (8423035).

42115145 is an equidigital number, since it uses as much as digits as its factorization.

42115145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8423034.

The product of its digits is 800, while the sum is 23.

The square root of 42115145 is about 6489.6182476321. The cubic root of 42115145 is about 347.9200310590.

Adding to 42115145 its reverse (54151124), we get a palindrome (96266269).

The spelling of 42115145 in words is "forty-two million, one hundred fifteen thousand, one hundred forty-five".