42620891 has 2 divisors, whose sum is σ = 42620892. Its totient is φ = 42620890.

The previous prime is 42620881. The next prime is 42620899. The reversal of 42620891 is 19802624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42620891 - 2⁶ = 42620827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42620899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310445 + 21310446.

It is an arithmetic number, because the mean of its divisors is an integer number (21310446).

Almost surely, 2^42620891 is an apocalyptic number.

42620891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42620891 is an equidigital number, since it uses as much as digits as its factorization.

42620891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 42620891 is about 6528.4677375323. The cubic root of 42620891 is about 349.3071764022.

The spelling of 42620891 in words is "forty-two million, six hundred twenty thousand, eight hundred ninety-one".