42506545 has 16 divisors (see below), whose sum is σ = 55330128. Its totient is φ = 31221760.

The previous prime is 42506539. The next prime is 42506587. The reversal of 42506545 is 54560524.

It can be written as a sum of positive squares in 8 ways, for example, as 399424 + 42107121 = 632^2 + 6489^2 .

It is not a de Polignac number, because 42506545 - 2⁷ = 42506417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (3458133).

Almost surely, 2^42506545 is an apocalyptic number.

It is an amenable number.

42506545 is a deficient number, since it is larger than the sum of its proper divisors (12823583).

42506545 is a wasteful number, since it uses less digits than its factorization.

42506545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12260.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 42506545 is about 6519.7043644632. The cubic root of 42506545 is about 348.9945155582.

The spelling of 42506545 in words is "forty-two million, five hundred six thousand, five hundred forty-five".