631545 has 16 divisors (see below), whose sum is σ = 1026432. Its totient is φ = 331520.

The previous prime is 631537. The next prime is 631549. The reversal of 631545 is 545136.

It is not a de Polignac number, because 631545 - 2³ = 631537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (64152).

2⁶³¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

631545 is a deficient number, since it is larger than the sum of its proper divisors (394887).

631545 is a wasteful number, since it uses less digits than its factorization.

631545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672.

The product of its digits is 1800, while the sum is 24.

The square root of 631545 is about 794.6980558678. The cubic root of 631545 is about 85.7962093728.

It can be divided in two parts, 631 and 545, that added together give a triangular number (1176 = T₄₈).

The spelling of 631545 in words is "six hundred thirty-one thousand, five hundred forty-five".