421791269 has 2 divisors, whose sum is σ = 421791270. Its totient is φ = 421791268.

The previous prime is 421791229. The next prime is 421791277. The reversal of 421791269 is 962197124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284596900 + 137194369 = 16870^2 + 11713^2 .

It is a cyclic number.

It is not a de Polignac number, because 421791269 - 2¹² = 421787173 is a prime.

It is a super-2 number, since 2×421791269² = 355815749209260722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421791229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210895634 + 210895635.

It is an arithmetic number, because the mean of its divisors is an integer number (210895635).

Almost surely, 2^421791269 is an apocalyptic number.

It is an amenable number.

421791269 is a deficient number, since it is larger than the sum of its proper divisors (1).

421791269 is an equidigital number, since it uses as much as digits as its factorization.

421791269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 421791269 is about 20537.5575227435. The cubic root of 421791269 is about 749.9503783466.

The spelling of 421791269 in words is "four hundred twenty-one million, seven hundred ninety-one thousand, two hundred sixty-nine".