631430549 has 2 divisors, whose sum is σ = 631430550. Its totient is φ = 631430548.

The previous prime is 631430519. The next prime is 631430563. The reversal of 631430549 is 945034136.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466128100 + 165302449 = 21590^2 + 12857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631430549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631430519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315715274 + 315715275.

It is an arithmetic number, because the mean of its divisors is an integer number (315715275).

Almost surely, 2^631430549 is an apocalyptic number.

It is an amenable number.

631430549 is a deficient number, since it is larger than the sum of its proper divisors (1).

631430549 is an equidigital number, since it uses as much as digits as its factorization.

631430549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 631430549 is about 25128.2818553120. The cubic root of 631430549 is about 857.9102628730.

It can be divided in two parts, 6314 and 30549, that added together give a palindrome (36863).

The spelling of 631430549 in words is "six hundred thirty-one million, four hundred thirty thousand, five hundred forty-nine".