690659441 has 2 divisors, whose sum is σ = 690659442. Its totient is φ = 690659440.

The previous prime is 690659399. The next prime is 690659461. The reversal of 690659441 is 144956096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371679841 + 318979600 = 19279^2 + 17860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690659441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690659392 and 690659401.

It is not a weakly prime, because it can be changed into another prime (690659461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345329720 + 345329721.

It is an arithmetic number, because the mean of its divisors is an integer number (345329721).

Almost surely, 2^690659441 is an apocalyptic number.

It is an amenable number.

690659441 is a deficient number, since it is larger than the sum of its proper divisors (1).

690659441 is an equidigital number, since it uses as much as digits as its factorization.

690659441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 690659441 is about 26280.4003203909. The cubic root of 690659441 is about 883.9370092398.

The spelling of 690659441 in words is "six hundred ninety million, six hundred fifty-nine thousand, four hundred forty-one".