434521391 has 2 divisors, whose sum is σ = 434521392. Its totient is φ = 434521390.

The previous prime is 434521337. The next prime is 434521421. The reversal of 434521391 is 193125434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 434521391 - 2¹⁴ = 434505007 is a prime.

It is a super-3 number, since 3×434521391³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (434521091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217260695 + 217260696.

It is an arithmetic number, because the mean of its divisors is an integer number (217260696).

Almost surely, 2^434521391 is an apocalyptic number.

434521391 is a deficient number, since it is larger than the sum of its proper divisors (1).

434521391 is an equidigital number, since it uses as much as digits as its factorization.

434521391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 434521391 is about 20845.1766843076. The cubic root of 434521391 is about 757.4204971258.

The spelling of 434521391 in words is "four hundred thirty-four million, five hundred twenty-one thousand, three hundred ninety-one".