531631421 has 4 divisors (see below), whose sum is σ = 531834912. Its totient is φ = 531427932.

The previous prime is 531631411. The next prime is 531631447. The reversal of 531631421 is 124136135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531631421 - 2¹⁰ = 531630397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531631411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97775 + ... + 103068.

It is an arithmetic number, because the mean of its divisors is an integer number (132958728).

Almost surely, 2^531631421 is an apocalyptic number.

It is an amenable number.

531631421 is a deficient number, since it is larger than the sum of its proper divisors (203491).

531631421 is a wasteful number, since it uses less digits than its factorization.

531631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203490.

The product of its digits is 2160, while the sum is 26.

The square root of 531631421 is about 23057.1338418286. The cubic root of 531631421 is about 810.0967323382.

Adding to 531631421 its reverse (124136135), we get a palindrome (655767556).

The spelling of 531631421 in words is "five hundred thirty-one million, six hundred thirty-one thousand, four hundred twenty-one".