103555961 has 2 divisors, whose sum is σ = 103555962. Its totient is φ = 103555960.

The previous prime is 103555957. The next prime is 103555981. The reversal of 103555961 is 169555301.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96432400 + 7123561 = 9820^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 103555961 - 2² = 103555957 is a prime.

It is a super-3 number, since 3×103555961³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (103555901) 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, 51777980 + 51777981.

It is an arithmetic number, because the mean of its divisors is an integer number (51777981).

Almost surely, 2^103555961 is an apocalyptic number.

It is an amenable number.

103555961 is a deficient number, since it is larger than the sum of its proper divisors (1).

103555961 is an equidigital number, since it uses as much as digits as its factorization.

103555961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 103555961 is about 10176.2449361245. The cubic root of 103555961 is about 469.5966979410.

The spelling of 103555961 in words is "one hundred three million, five hundred fifty-five thousand, nine hundred sixty-one".