631549 has 2 divisors, whose sum is σ = 631550. Its totient is φ = 631548.

The previous prime is 631537. The next prime is 631559. The reversal of 631549 is 945136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 127449 = 710^2 + 357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315774 + 315775.

It is an arithmetic number, because the mean of its divisors is an integer number (315775).

2⁶³¹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

631549 is a deficient number, since it is larger than the sum of its proper divisors (1).

631549 is an equidigital number, since it uses as much as digits as its factorization.

631549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 631549 is about 794.7005725429. The cubic root of 631549 is about 85.7963905075.

The spelling of 631549 in words is "six hundred thirty-one thousand, five hundred forty-nine".