42546109 has 2 divisors, whose sum is σ = 42546110. Its totient is φ = 42546108.

The previous prime is 42546083. The next prime is 42546131. The reversal of 42546109 is 90164524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22992025 + 19554084 = 4795^2 + 4422^2 .

It is a cyclic number.

It is not a de Polignac number, because 42546109 - 2¹³ = 42537917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42546169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21273054 + 21273055.

It is an arithmetic number, because the mean of its divisors is an integer number (21273055).

Almost surely, 2^42546109 is an apocalyptic number.

It is an amenable number.

42546109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42546109 is an equidigital number, since it uses as much as digits as its factorization.

42546109 is an evil number, because the sum of its binary digits is even.

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

The square root of 42546109 is about 6522.7378454143. The cubic root of 42546109 is about 349.1027603575.

The spelling of 42546109 in words is "forty-two million, five hundred forty-six thousand, one hundred nine".