631537 has 2 divisors, whose sum is σ = 631538. Its totient is φ = 631536.

The previous prime is 631531. The next prime is 631549. The reversal of 631537 is 735136.

It is a happy number.

631537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474721 + 156816 = 689^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 631537 - 2³ = 631529 is a prime.

631537 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (631531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315768 + 315769.

It is an arithmetic number, because the mean of its divisors is an integer number (315769).

2⁶³¹⁵³⁷ is an apocalyptic number.

It is an amenable number.

631537 is a deficient number, since it is larger than the sum of its proper divisors (1).

631537 is an equidigital number, since it uses as much as digits as its factorization.

631537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 25.

The square root of 631537 is about 794.6930224936. The cubic root of 631537 is about 85.7958471011.

It can be divided in two parts, 63 and 1537, that added together give a square (1600 = 40²).

The spelling of 631537 in words is "six hundred thirty-one thousand, five hundred thirty-seven".