421625791 has 2 divisors, whose sum is σ = 421625792. Its totient is φ = 421625790.

The previous prime is 421625749. The next prime is 421625803. The reversal of 421625791 is 197526124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421625791 - 2¹⁵ = 421593023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421625791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421625731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210812895 + 210812896.

It is an arithmetic number, because the mean of its divisors is an integer number (210812896).

Almost surely, 2^421625791 is an apocalyptic number.

421625791 is a deficient number, since it is larger than the sum of its proper divisors (1).

421625791 is an equidigital number, since it uses as much as digits as its factorization.

421625791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 421625791 is about 20533.5284595707. The cubic root of 421625791 is about 749.8522915041.

The spelling of 421625791 in words is "four hundred twenty-one million, six hundred twenty-five thousand, seven hundred ninety-one".