42505501 has 2 divisors, whose sum is σ = 42505502. Its totient is φ = 42505500.

The previous prime is 42505469. The next prime is 42505511. The reversal of 42505501 is 10550524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 15413476 = 5205^2 + 3926^2 .

It is a cyclic number.

It is not a de Polignac number, because 42505501 - 2⁵ = 42505469 is a prime.

It is a super-2 number, since 2×42505501² = 3613435230522002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42505511) 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 as a sum of consecutive naturals, namely, 21252750 + 21252751.

It is an arithmetic number, because the mean of its divisors is an integer number (21252751).

Almost surely, 2^42505501 is an apocalyptic number.

It is an amenable number.

42505501 is a deficient number, since it is larger than the sum of its proper divisors (1).

42505501 is an equidigital number, since it uses as much as digits as its factorization.

42505501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 42505501 is about 6519.6242989915. The cubic root of 42505501 is about 348.9916583256.

The spelling of 42505501 in words is "forty-two million, five hundred five thousand, five hundred one".