42681545 has 8 divisors (see below), whose sum is σ = 51404424. Its totient is φ = 34020864.

The previous prime is 42681539. The next prime is 42681547. The reversal of 42681545 is 54518624.

It can be written as a sum of positive squares in 4 ways, for example, as 937024 + 41744521 = 968^2 + 6461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42681545 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42681547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14024 + ... + 16793.

It is an arithmetic number, because the mean of its divisors is an integer number (6425553).

Almost surely, 2^42681545 is an apocalyptic number.

It is an amenable number.

42681545 is a deficient number, since it is larger than the sum of its proper divisors (8722879).

42681545 is a wasteful number, since it uses less digits than its factorization.

42681545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31099.

The product of its digits is 38400, while the sum is 35.

The square root of 42681545 is about 6533.1114333065. Note that the first 3 decimals coincide. The cubic root of 42681545 is about 349.4727981160.

The spelling of 42681545 in words is "forty-two million, six hundred eighty-one thousand, five hundred forty-five".