631401 has 4 divisors (see below), whose sum is σ = 841872. Its totient is φ = 420932.

The previous prime is 631399. The next prime is 631409. The reversal of 631401 is 104136.

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 631401 - 2¹ = 631399 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 631401.

It is not an unprimeable number, because it can be changed into a prime (631409) 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, 105231 + ... + 105236.

It is an arithmetic number, because the mean of its divisors is an integer number (210468).

2⁶³¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

631401 is a deficient number, since it is larger than the sum of its proper divisors (210471).

631401 is a wasteful number, since it uses less digits than its factorization.

631401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210470.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 631401 is about 794.6074502545. The cubic root of 631401 is about 85.7896880147.

Adding to 631401 its reverse (104136), we get a palindrome (735537).

The spelling of 631401 in words is "six hundred thirty-one thousand, four hundred one".