42130861 has 4 divisors (see below), whose sum is σ = 42144732. Its totient is φ = 42116992.

The previous prime is 42130849. The next prime is 42130867. The reversal of 42130861 is 16803124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26842761 + 15288100 = 5181^2 + 3910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42130861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42130867) 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, 196 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (10536183).

Almost surely, 2^42130861 is an apocalyptic number.

It is an amenable number.

42130861 is a deficient number, since it is larger than the sum of its proper divisors (13871).

42130861 is an equidigital number, since it uses as much as digits as its factorization.

42130861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13870.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 42130861 is about 6490.8289917390. The cubic root of 42130861 is about 347.9633031503.

Adding to 42130861 its reverse (16803124), we get a palindrome (58933985).

The spelling of 42130861 in words is "forty-two million, one hundred thirty thousand, eight hundred sixty-one".