698961553 has 2 divisors, whose sum is σ = 698961554. Its totient is φ = 698961552.

The previous prime is 698961551. The next prime is 698961587. The reversal of 698961553 is 355169896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 698703489 + 258064 = 26433^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 698961553 - 2¹ = 698961551 is a prime.

Together with 698961551, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 698961553.

It is not a weakly prime, because it can be changed into another prime (698961551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349480776 + 349480777.

It is an arithmetic number, because the mean of its divisors is an integer number (349480777).

Almost surely, 2^698961553 is an apocalyptic number.

It is an amenable number.

698961553 is a deficient number, since it is larger than the sum of its proper divisors (1).

698961553 is an equidigital number, since it uses as much as digits as its factorization.

698961553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 52.

The square root of 698961553 is about 26437.8810232590. The cubic root of 698961553 is about 887.4647171849.

The spelling of 698961553 in words is "six hundred ninety-eight million, nine hundred sixty-one thousand, five hundred fifty-three".