421151281 has 2 divisors, whose sum is σ = 421151282. Its totient is φ = 421151280.

The previous prime is 421151273. The next prime is 421151287. The reversal of 421151281 is 182151124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420906256 + 245025 = 20516^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 421151281 - 2³ = 421151273 is a prime.

It is a super-2 number, since 2×421151281² = 354736802975881922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421151287) 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, 210575640 + 210575641.

It is an arithmetic number, because the mean of its divisors is an integer number (210575641).

Almost surely, 2^421151281 is an apocalyptic number.

It is an amenable number.

421151281 is a deficient number, since it is larger than the sum of its proper divisors (1).

421151281 is an equidigital number, since it uses as much as digits as its factorization.

421151281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 25.

The square root of 421151281 is about 20521.9706899703. The cubic root of 421151281 is about 749.5708840076.

The spelling of 421151281 in words is "four hundred twenty-one million, one hundred fifty-one thousand, two hundred eighty-one".