101698561 has 2 divisors, whose sum is σ = 101698562. Its totient is φ = 101698560.

The previous prime is 101698549. The next prime is 101698567. The reversal of 101698561 is 165896101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76387600 + 25310961 = 8740^2 + 5031^2 .

It is a cyclic number.

It is not a de Polignac number, because 101698561 - 2²¹ = 99601409 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is equal to p_5853592 and since 101698561 and 5853592 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101698561.

It is not a weakly prime, because it can be changed into another prime (101698567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50849280 + 50849281.

It is an arithmetic number, because the mean of its divisors is an integer number (50849281).

Almost surely, 2^101698561 is an apocalyptic number.

It is an amenable number.

101698561 is a deficient number, since it is larger than the sum of its proper divisors (1).

101698561 is an equidigital number, since it uses as much as digits as its factorization.

101698561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 101698561 is about 10084.5704420169. The cubic root of 101698561 is about 466.7721500214.

The spelling of 101698561 in words is "one hundred one million, six hundred ninety-eight thousand, five hundred sixty-one".