42181157 has 2 divisors, whose sum is σ = 42181158. Its totient is φ = 42181156.

The previous prime is 42181141. The next prime is 42181189. The reversal of 42181157 is 75118124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25542916 + 16638241 = 5054^2 + 4079^2 .

It is a cyclic number.

It is not a de Polignac number, because 42181157 - 2⁴ = 42181141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42181127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21090578 + 21090579.

It is an arithmetic number, because the mean of its divisors is an integer number (21090579).

Almost surely, 2^42181157 is an apocalyptic number.

It is an amenable number.

42181157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42181157 is an equidigital number, since it uses as much as digits as its factorization.

42181157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 42181157 is about 6494.7022256605. The cubic root of 42181157 is about 348.1017147736.

The spelling of 42181157 in words is "forty-two million, one hundred eighty-one thousand, one hundred fifty-seven".