42812109 has 6 divisors (see below), whose sum is σ = 61839726. Its totient is φ = 28541400.

The previous prime is 42812101. The next prime is 42812167. The reversal of 42812109 is 90121824.

It can be written as a sum of positive squares in only one way, i.e., 42536484 + 275625 = 6522^2 + 525^2 .

It is not a de Polignac number, because 42812109 - 2³ = 42812101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42812101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2378442 + ... + 2378459.

It is an arithmetic number, because the mean of its divisors is an integer number (10306621).

Almost surely, 2^42812109 is an apocalyptic number.

It is an amenable number.

42812109 is a deficient number, since it is larger than the sum of its proper divisors (19027617).

42812109 is a wasteful number, since it uses less digits than its factorization.

42812109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756907 (or 4756904 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42812109 is about 6543.0962853988. The cubic root of 42812109 is about 349.8287842842.

The spelling of 42812109 in words is "forty-two million, eight hundred twelve thousand, one hundred nine".