631147549 has 2 divisors, whose sum is σ = 631147550. Its totient is φ = 631147548.

The previous prime is 631147523. The next prime is 631147553. The reversal of 631147549 is 945741136.

631147549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437102649 + 194044900 = 20907^2 + 13930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631147549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631147579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315573774 + 315573775.

It is an arithmetic number, because the mean of its divisors is an integer number (315573775).

Almost surely, 2^631147549 is an apocalyptic number.

It is an amenable number.

631147549 is a deficient number, since it is larger than the sum of its proper divisors (1).

631147549 is an equidigital number, since it uses as much as digits as its factorization.

631147549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 631147549 is about 25122.6501189664. The cubic root of 631147549 is about 857.7820751752.

The spelling of 631147549 in words is "six hundred thirty-one million, one hundred forty-seven thousand, five hundred forty-nine".