634490261 has 2 divisors, whose sum is σ = 634490262. Its totient is φ = 634490260.

The previous prime is 634490249. The next prime is 634490273. The reversal of 634490261 is 162094436.

634490261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (634490249) and next prime (634490273).

It can be written as a sum of positive squares in only one way, i.e., 524135236 + 110355025 = 22894^2 + 10505^2 .

It is a cyclic number.

It is not a de Polignac number, because 634490261 - 2¹⁴ = 634473877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634490221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317245130 + 317245131.

It is an arithmetic number, because the mean of its divisors is an integer number (317245131).

Almost surely, 2^634490261 is an apocalyptic number.

It is an amenable number.

634490261 is a deficient number, since it is larger than the sum of its proper divisors (1).

634490261 is an equidigital number, since it uses as much as digits as its factorization.

634490261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 634490261 is about 25189.0901185414. The cubic root of 634490261 is about 859.2937508923.

The spelling of 634490261 in words is "six hundred thirty-four million, four hundred ninety thousand, two hundred sixty-one".