42006551 has 2 divisors, whose sum is σ = 42006552. Its totient is φ = 42006550.

The previous prime is 42006493. The next prime is 42006557. The reversal of 42006551 is 15560024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42006551 - 2¹⁴ = 41990167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42006557) 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, 21003275 + 21003276.

It is an arithmetic number, because the mean of its divisors is an integer number (21003276).

Almost surely, 2^42006551 is an apocalyptic number.

42006551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42006551 is an equidigital number, since it uses as much as digits as its factorization.

42006551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 42006551 is about 6481.2460993238. The cubic root of 42006551 is about 347.6207361289.

Adding to 42006551 its reverse (15560024), we get a palindrome (57566575).

The spelling of 42006551 in words is "forty-two million, six thousand, five hundred fifty-one".