696091621 has 2 divisors, whose sum is σ = 696091622. Its totient is φ = 696091620.

The previous prime is 696091579. The next prime is 696091631. The reversal of 696091621 is 126190696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 483340225 + 212751396 = 21985^2 + 14586^2 .

It is a cyclic number.

It is not a de Polignac number, because 696091621 - 2¹¹ = 696089573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (696091631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348045810 + 348045811.

It is an arithmetic number, because the mean of its divisors is an integer number (348045811).

Almost surely, 2^696091621 is an apocalyptic number.

It is an amenable number.

696091621 is a deficient number, since it is larger than the sum of its proper divisors (1).

696091621 is an equidigital number, since it uses as much as digits as its factorization.

696091621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 696091621 is about 26383.5483019248. The cubic root of 696091621 is about 886.2484093197.

The spelling of 696091621 in words is "six hundred ninety-six million, ninety-one thousand, six hundred twenty-one".