631542001 has 2 divisors, whose sum is σ = 631542002. Its totient is φ = 631542000.

The previous prime is 631541987. The next prime is 631542017. The reversal of 631542001 is 100245136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621205776 + 10336225 = 24924^2 + 3215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631542001 is a prime.

It is not a weakly prime, because it can be changed into another prime (631542031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315771000 + 315771001.

It is an arithmetic number, because the mean of its divisors is an integer number (315771001).

Almost surely, 2^631542001 is an apocalyptic number.

It is an amenable number.

631542001 is a deficient number, since it is larger than the sum of its proper divisors (1).

631542001 is an equidigital number, since it uses as much as digits as its factorization.

631542001 is an odious number, because the sum of its binary digits is odd.

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

The square root of 631542001 is about 25130.4994180378. The cubic root of 631542001 is about 857.9607356657.

Adding to 631542001 its reverse (100245136), we get a palindrome (731787137).

The spelling of 631542001 in words is "six hundred thirty-one million, five hundred forty-two thousand, one".