42087169 has 2 divisors, whose sum is σ = 42087170. Its totient is φ = 42087168.

The previous prime is 42087151. The next prime is 42087187. The reversal of 42087169 is 96178024.

It is a balanced prime because it is at equal distance from previous prime (42087151) and next prime (42087187).

It can be written as a sum of positive squares in only one way, i.e., 37356544 + 4730625 = 6112^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 42087169 - 2²¹ = 39990017 is a prime.

It is a super-2 number, since 2×42087169² = 3542659588869122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42087469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21043584 + 21043585.

It is an arithmetic number, because the mean of its divisors is an integer number (21043585).

Almost surely, 2^42087169 is an apocalyptic number.

It is an amenable number.

42087169 is a deficient number, since it is larger than the sum of its proper divisors (1).

42087169 is an equidigital number, since it uses as much as digits as its factorization.

42087169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 42087169 is about 6487.4624469048. The cubic root of 42087169 is about 347.8429759062.

The spelling of 42087169 in words is "forty-two million, eighty-seven thousand, one hundred sixty-nine".