42872513 has 2 divisors, whose sum is σ = 42872514. Its totient is φ = 42872512.

The previous prime is 42872497. The next prime is 42872567. The reversal of 42872513 is 31527824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23309584 + 19562929 = 4828^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 42872513 - 2⁴ = 42872497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42872513.

It is not a weakly prime, because it can be changed into another prime (42878513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21436256 + 21436257.

It is an arithmetic number, because the mean of its divisors is an integer number (21436257).

Almost surely, 2^42872513 is an apocalyptic number.

It is an amenable number.

42872513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42872513 is an equidigital number, since it uses as much as digits as its factorization.

42872513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 42872513 is about 6547.7105158979. The cubic root of 42872513 is about 349.9932325222.

The spelling of 42872513 in words is "forty-two million, eight hundred seventy-two thousand, five hundred thirteen".