420124531 has 2 divisors, whose sum is σ = 420124532. Its totient is φ = 420124530.

The previous prime is 420124517. The next prime is 420124541. The reversal of 420124531 is 135421024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420124531 - 2¹³ = 420116339 is a prime.

It is a super-2 number, since 2×420124531² = 353009243095939922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_22350712 and since 420124531 and 22350712 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (420124511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210062265 + 210062266.

It is an arithmetic number, because the mean of its divisors is an integer number (210062266).

Almost surely, 2^420124531 is an apocalyptic number.

420124531 is a deficient number, since it is larger than the sum of its proper divisors (1).

420124531 is an equidigital number, since it uses as much as digits as its factorization.

420124531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 420124531 is about 20496.9395520404. The cubic root of 420124531 is about 748.9612470242.

Adding to 420124531 its reverse (135421024), we get a palindrome (555545555).

The spelling of 420124531 in words is "four hundred twenty million, one hundred twenty-four thousand, five hundred thirty-one".