42155513 has 2 divisors, whose sum is σ = 42155514. Its totient is φ = 42155512.

The previous prime is 42155507. The next prime is 42155551. The reversal of 42155513 is 31555124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39100009 + 3055504 = 6253^2 + 1748^2 .

It is a cyclic number.

It is not a de Polignac number, because 42155513 - 2⁴ = 42155497 is a prime.

It is a super-3 number, since 3×42155513³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42155213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077756 + 21077757.

It is an arithmetic number, because the mean of its divisors is an integer number (21077757).

Almost surely, 2^42155513 is an apocalyptic number.

It is an amenable number.

42155513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155513 is an equidigital number, since it uses as much as digits as its factorization.

42155513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 26.

The square root of 42155513 is about 6492.7277010514. The cubic root of 42155513 is about 348.0311577555.

The spelling of 42155513 in words is "forty-two million, one hundred fifty-five thousand, five hundred thirteen".