690563473 has 2 divisors, whose sum is σ = 690563474. Its totient is φ = 690563472.

The previous prime is 690563413. The next prime is 690563507. The reversal of 690563473 is 374365096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381928849 + 308634624 = 19543^2 + 17568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690563473 is a prime.

It is not a weakly prime, because it can be changed into another prime (690563413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345281736 + 345281737.

It is an arithmetic number, because the mean of its divisors is an integer number (345281737).

Almost surely, 2^690563473 is an apocalyptic number.

It is an amenable number.

690563473 is a deficient number, since it is larger than the sum of its proper divisors (1).

690563473 is an equidigital number, since it uses as much as digits as its factorization.

690563473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 43.

The square root of 690563473 is about 26278.5744095832. The cubic root of 690563473 is about 883.8960659561.

The spelling of 690563473 in words is "six hundred ninety million, five hundred sixty-three thousand, four hundred seventy-three".