697420561 has 2 divisors, whose sum is σ = 697420562. Its totient is φ = 697420560.

The previous prime is 697420553. The next prime is 697420567. The reversal of 697420561 is 165024796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688747536 + 8673025 = 26244^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 697420561 - 2³ = 697420553 is a prime.

It is not a weakly prime, because it can be changed into another prime (697420567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348710280 + 348710281.

It is an arithmetic number, because the mean of its divisors is an integer number (348710281).

Almost surely, 2^697420561 is an apocalyptic number.

It is an amenable number.

697420561 is a deficient number, since it is larger than the sum of its proper divisors (1).

697420561 is an equidigital number, since it uses as much as digits as its factorization.

697420561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 697420561 is about 26408.7213056596. The cubic root of 697420561 is about 886.8120430941.

The spelling of 697420561 in words is "six hundred ninety-seven million, four hundred twenty thousand, five hundred sixty-one".