42640553 has 2 divisors, whose sum is σ = 42640554. Its totient is φ = 42640552.

The previous prime is 42640517. The next prime is 42640561. The reversal of 42640553 is 35504624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24730729 + 17909824 = 4973^2 + 4232^2 .

It is a cyclic number.

It is not a de Polignac number, because 42640553 - 2⁶ = 42640489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42640513) 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, 21320276 + 21320277.

It is an arithmetic number, because the mean of its divisors is an integer number (21320277).

Almost surely, 2^42640553 is an apocalyptic number.

It is an amenable number.

42640553 is a deficient number, since it is larger than the sum of its proper divisors (1).

42640553 is an equidigital number, since it uses as much as digits as its factorization.

42640553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 42640553 is about 6529.9734302675. The cubic root of 42640553 is about 349.3608826299.

The spelling of 42640553 in words is "forty-two million, six hundred forty thousand, five hundred fifty-three".