531621601 has 4 divisors (see below), whose sum is σ = 607567552. Its totient is φ = 455675652.

The previous prime is 531621593. The next prime is 531621611. The reversal of 531621601 is 106126135.

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 531621601 - 2³ = 531621593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531621611) 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, 37972965 + ... + 37972978.

It is an arithmetic number, because the mean of its divisors is an integer number (151891888).

Almost surely, 2^531621601 is an apocalyptic number.

It is an amenable number.

531621601 is a deficient number, since it is larger than the sum of its proper divisors (75945951).

531621601 is an equidigital number, since it uses as much as digits as its factorization.

531621601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75945950.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 531621601 is about 23056.9208915675. The cubic root of 531621601 is about 810.0917444220.

Adding to 531621601 its reverse (106126135), we get a palindrome (637747736).

The spelling of 531621601 in words is "five hundred thirty-one million, six hundred twenty-one thousand, six hundred one".