631701401 has 2 divisors, whose sum is σ = 631701402. Its totient is φ = 631701400.

The previous prime is 631701373. The next prime is 631701409. The reversal of 631701401 is 104107136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451605001 + 180096400 = 21251^2 + 13420^2 .

It is a cyclic number.

It is not a de Polignac number, because 631701401 - 2¹⁴ = 631685017 is a prime.

It is not a weakly prime, because it can be changed into another prime (631701409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315850700 + 315850701.

It is an arithmetic number, because the mean of its divisors is an integer number (315850701).

Almost surely, 2^631701401 is an apocalyptic number.

It is an amenable number.

631701401 is a deficient number, since it is larger than the sum of its proper divisors (1).

631701401 is an equidigital number, since it uses as much as digits as its factorization.

631701401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 631701401 is about 25133.6706630767. The cubic root of 631701401 is about 858.0329121463.

Adding to 631701401 its reverse (104107136), we get a palindrome (735808537).

The spelling of 631701401 in words is "six hundred thirty-one million, seven hundred one thousand, four hundred one".