421523131 has 2 divisors, whose sum is σ = 421523132. Its totient is φ = 421523130.

The previous prime is 421523111. The next prime is 421523147. The reversal of 421523131 is 131325124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421523131 - 2⁵ = 421523099 is a prime.

It is a super-2 number, since 2×421523131² = 355363499936086322, which contains 22 as substring.

It is equal to p_22421236 and since 421523131 and 22421236 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 (421523111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210761565 + 210761566.

It is an arithmetic number, because the mean of its divisors is an integer number (210761566).

Almost surely, 2^421523131 is an apocalyptic number.

421523131 is a deficient number, since it is larger than the sum of its proper divisors (1).

421523131 is an equidigital number, since it uses as much as digits as its factorization.

421523131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 421523131 is about 20531.0284934779. The cubic root of 421523131 is about 749.7914270388.

Adding to 421523131 its reverse (131325124), we get a palindrome (552848255).

The spelling of 421523131 in words is "four hundred twenty-one million, five hundred twenty-three thousand, one hundred thirty-one".