634551977 has 2 divisors, whose sum is σ = 634551978. Its totient is φ = 634551976.

The previous prime is 634551919. The next prime is 634552003. The reversal of 634551977 is 779155436.

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., 623950441 + 10601536 = 24979^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 634551977 - 2⁶ = 634551913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634551917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317275988 + 317275989.

It is an arithmetic number, because the mean of its divisors is an integer number (317275989).

Almost surely, 2^634551977 is an apocalyptic number.

It is an amenable number.

634551977 is a deficient number, since it is larger than the sum of its proper divisors (1).

634551977 is an equidigital number, since it uses as much as digits as its factorization.

634551977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 47.

The square root of 634551977 is about 25190.3151429275. The cubic root of 634551977 is about 859.3216107650.

The spelling of 634551977 in words is "six hundred thirty-four million, five hundred fifty-one thousand, nine hundred seventy-seven".