42507551 has 2 divisors, whose sum is σ = 42507552. Its totient is φ = 42507550.

The previous prime is 42507523. The next prime is 42507559. The reversal of 42507551 is 15570524.

42507551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42507551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42507559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253775 + 21253776.

It is an arithmetic number, because the mean of its divisors is an integer number (21253776).

Almost surely, 2^42507551 is an apocalyptic number.

42507551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42507551 is an equidigital number, since it uses as much as digits as its factorization.

42507551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 42507551 is about 6519.7815147442. The cubic root of 42507551 is about 348.9972687476.

The spelling of 42507551 in words is "forty-two million, five hundred seven thousand, five hundred fifty-one".