321424531 has 2 divisors, whose sum is σ = 321424532. Its totient is φ = 321424530.

The previous prime is 321424483. The next prime is 321424549. The reversal of 321424531 is 135424123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321424531 - 2⁷ = 321424403 is a prime.

It is a super-2 number, since 2×321424531² = 206627458257139922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321424496 and 321424505.

It is not a weakly prime, because it can be changed into another prime (321424561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160712265 + 160712266.

It is an arithmetic number, because the mean of its divisors is an integer number (160712266).

Almost surely, 2^321424531 is an apocalyptic number.

321424531 is a deficient number, since it is larger than the sum of its proper divisors (1).

321424531 is an equidigital number, since it uses as much as digits as its factorization.

321424531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 321424531 is about 17928.3164574926. The cubic root of 321424531 is about 685.0038403536.

Adding to 321424531 its reverse (135424123), we get a palindrome (456848654).

The spelling of 321424531 in words is "three hundred twenty-one million, four hundred twenty-four thousand, five hundred thirty-one".