102775721 has 2 divisors, whose sum is σ = 102775722. Its totient is φ = 102775720.

The previous prime is 102775711. The next prime is 102775733. The reversal of 102775721 is 127577201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 3474496 = 9965^2 + 1864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102775721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102775711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51387860 + 51387861.

It is an arithmetic number, because the mean of its divisors is an integer number (51387861).

Almost surely, 2^102775721 is an apocalyptic number.

It is an amenable number.

102775721 is a deficient number, since it is larger than the sum of its proper divisors (1).

102775721 is an equidigital number, since it uses as much as digits as its factorization.

102775721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 102775721 is about 10137.8361103344. The cubic root of 102775721 is about 468.4143349577.

The spelling of 102775721 in words is "one hundred two million, seven hundred seventy-five thousand, seven hundred twenty-one".