42131081 has 2 divisors, whose sum is σ = 42131082. Its totient is φ = 42131080.

The previous prime is 42131029. The next prime is 42131093. The reversal of 42131081 is 18013124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 16679056 = 5045^2 + 4084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42131081 is a prime.

It is a super-2 number, since 2×42131081² = 3550055972457122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42131021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065540 + 21065541.

It is an arithmetic number, because the mean of its divisors is an integer number (21065541).

Almost surely, 2^42131081 is an apocalyptic number.

It is an amenable number.

42131081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131081 is an equidigital number, since it uses as much as digits as its factorization.

42131081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 42131081 is about 6490.8459387048. The cubic root of 42131081 is about 347.9639088171.

The spelling of 42131081 in words is "forty-two million, one hundred thirty-one thousand, eighty-one".