421152493 has 2 divisors, whose sum is σ = 421152494. Its totient is φ = 421152492.

The previous prime is 421152481. The next prime is 421152497. The reversal of 421152493 is 394251124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421152484 + 9 = 20522^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 421152493 - 2¹⁷ = 421021421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421152497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210576246 + 210576247.

It is an arithmetic number, because the mean of its divisors is an integer number (210576247).

Almost surely, 2^421152493 is an apocalyptic number.

It is an amenable number.

421152493 is a deficient number, since it is larger than the sum of its proper divisors (1).

421152493 is an equidigital number, since it uses as much as digits as its factorization.

421152493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 421152493 is about 20522.0002192769. Note that the first 3 decimals coincide. The cubic root of 421152493 is about 749.5716030517.

The spelling of 421152493 in words is "four hundred twenty-one million, one hundred fifty-two thousand, four hundred ninety-three".