531321101 has 4 divisors (see below), whose sum is σ = 531368832. Its totient is φ = 531273372.

The previous prime is 531321079. The next prime is 531321107. The reversal of 531321101 is 101123135.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 531321101 - 2¹⁰ = 531320077 is a prime.

It is a super-2 number, since 2×531321101² = 564604224735704402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531321101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531321107) 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, 2660 + ... + 32706.

It is an arithmetic number, because the mean of its divisors is an integer number (132842208).

Almost surely, 2^531321101 is an apocalyptic number.

It is an amenable number.

531321101 is a deficient number, since it is larger than the sum of its proper divisors (47731).

531321101 is a wasteful number, since it uses less digits than its factorization.

531321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47730.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 531321101 is about 23050.4034888763. The cubic root of 531321101 is about 809.9390804156.

Adding to 531321101 its reverse (101123135), we get a palindrome (632444236).

The spelling of 531321101 in words is "five hundred thirty-one million, three hundred twenty-one thousand, one hundred one".