42206551 has 2 divisors, whose sum is σ = 42206552. Its totient is φ = 42206550.

The previous prime is 42206533. The next prime is 42206561. The reversal of 42206551 is 15560224.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42206551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42206501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21103275 + 21103276.

It is an arithmetic number, because the mean of its divisors is an integer number (21103276).

Almost surely, 2^42206551 is an apocalyptic number.

42206551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42206551 is an equidigital number, since it uses as much as digits as its factorization.

42206551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 42206551 is about 6496.6569095189. The cubic root of 42206551 is about 348.1715557664.

Adding to 42206551 its reverse (15560224), we get a palindrome (57766775).

The spelling of 42206551 in words is "forty-two million, two hundred six thousand, five hundred fifty-one".