42402551 has 2 divisors, whose sum is σ = 42402552. Its totient is φ = 42402550.

The previous prime is 42402523. The next prime is 42402559. The reversal of 42402551 is 15520424.

It is a happy number.

42402551 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 not a de Polignac number, because 42402551 - 2¹⁸ = 42140407 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 (42402559) 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, 21201275 + 21201276.

It is an arithmetic number, because the mean of its divisors is an integer number (21201276).

Almost surely, 2^42402551 is an apocalyptic number.

42402551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402551 is an equidigital number, since it uses as much as digits as its factorization.

42402551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42402551 is about 6511.7241188490. The cubic root of 42402551 is about 348.7096733560.

Adding to 42402551 its reverse (15520424), we get a palindrome (57922975).

The spelling of 42402551 in words is "forty-two million, four hundred two thousand, five hundred fifty-one".