63490781 has 2 divisors, whose sum is σ = 63490782. Its totient is φ = 63490780.

The previous prime is 63490771. The next prime is 63490789. The reversal of 63490781 is 18709436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53787556 + 9703225 = 7334^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 63490781 - 2⁶ = 63490717 is a prime.

It is a super-2 number, since 2×63490781² = 8062158543979922, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63490789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31745390 + 31745391.

It is an arithmetic number, because the mean of its divisors is an integer number (31745391).

Almost surely, 2^63490781 is an apocalyptic number.

It is an amenable number.

63490781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63490781 is an equidigital number, since it uses as much as digits as its factorization.

63490781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 63490781 is about 7968.1102527513. The cubic root of 63490781 is about 398.9363009515.

The spelling of 63490781 in words is "sixty-three million, four hundred ninety thousand, seven hundred eighty-one".