531631601 has 2 divisors, whose sum is σ = 531631602. Its totient is φ = 531631600.

The previous prime is 531631561. The next prime is 531631603. The reversal of 531631601 is 106136135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514200976 + 17430625 = 22676^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 531631601 - 2⁶ = 531631537 is a prime.

Together with 531631603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (531631603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265815800 + 265815801.

It is an arithmetic number, because the mean of its divisors is an integer number (265815801).

Almost surely, 2^531631601 is an apocalyptic number.

It is an amenable number.

531631601 is a deficient number, since it is larger than the sum of its proper divisors (1).

531631601 is an equidigital number, since it uses as much as digits as its factorization.

531631601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 531631601 is about 23057.1377451756. The cubic root of 531631601 is about 810.0968237658.

Adding to 531631601 its reverse (106136135), we get a palindrome (637767736).

The spelling of 531631601 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred one".