635490649 has 2 divisors, whose sum is σ = 635490650. Its totient is φ = 635490648.

The previous prime is 635490641. The next prime is 635490697. The reversal of 635490649 is 946094536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560979225 + 74511424 = 23685^2 + 8632^2 .

It is a cyclic number.

It is not a de Polignac number, because 635490649 - 2³ = 635490641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 635490599 and 635490608.

It is not a weakly prime, because it can be changed into another prime (635490641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317745324 + 317745325.

It is an arithmetic number, because the mean of its divisors is an integer number (317745325).

Almost surely, 2^635490649 is an apocalyptic number.

It is an amenable number.

635490649 is a deficient number, since it is larger than the sum of its proper divisors (1).

635490649 is an equidigital number, since it uses as much as digits as its factorization.

635490649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 635490649 is about 25208.9398626757. The cubic root of 635490649 is about 859.7451241281.

The spelling of 635490649 in words is "six hundred thirty-five million, four hundred ninety thousand, six hundred forty-nine".