102171977 has 2 divisors, whose sum is σ = 102171978. Its totient is φ = 102171976.

The previous prime is 102171961. The next prime is 102171991. The reversal of 102171977 is 779171201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56190016 + 45981961 = 7496^2 + 6781^2 .

It is a cyclic number.

It is not a de Polignac number, because 102171977 - 2⁴ = 102171961 is a prime.

It is a super-2 number, since 2×102171977² = 20878225768177058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102171907) 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, 51085988 + 51085989.

It is an arithmetic number, because the mean of its divisors is an integer number (51085989).

Almost surely, 2^102171977 is an apocalyptic number.

It is an amenable number.

102171977 is a deficient number, since it is larger than the sum of its proper divisors (1).

102171977 is an equidigital number, since it uses as much as digits as its factorization.

102171977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6174, while the sum is 35.

The square root of 102171977 is about 10108.0154827741. The cubic root of 102171977 is about 467.4953179014.

The spelling of 102171977 in words is "one hundred two million, one hundred seventy-one thousand, nine hundred seventy-seven".