42131543161 has 2 divisors, whose sum is σ = 42131543162. Its totient is φ = 42131543160.

The previous prime is 42131543149. The next prime is 42131543191. The reversal of 42131543161 is 16134513124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40247983161 + 1883560000 = 200619^2 + 43400^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131543161 - 2¹³ = 42131534969 is a prime.

It is not a weakly prime, because it can be changed into another prime (42131543131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065771580 + 21065771581.

It is an arithmetic number, because the mean of its divisors is an integer number (21065771581).

Almost surely, 2^42131543161 is an apocalyptic number.

It is an amenable number.

42131543161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131543161 is an equidigital number, since it uses as much as digits as its factorization.

42131543161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The spelling of 42131543161 in words is "forty-two billion, one hundred thirty-one million, five hundred forty-three thousand, one hundred sixty-one".