102190681 has 2 divisors, whose sum is σ = 102190682. Its totient is φ = 102190680.

The previous prime is 102190667. The next prime is 102190703. The reversal of 102190681 is 186091201.

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., 97713225 + 4477456 = 9885^2 + 2116^2 .

It is an emirp because it is prime and its reverse (186091201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102190681 - 2¹⁹ = 101666393 is a prime.

It is a super-2 number, since 2×102190681² = 20885870566487522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102190651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51095340 + 51095341.

It is an arithmetic number, because the mean of its divisors is an integer number (51095341).

Almost surely, 2^102190681 is an apocalyptic number.

It is an amenable number.

102190681 is a deficient number, since it is larger than the sum of its proper divisors (1).

102190681 is an equidigital number, since it uses as much as digits as its factorization.

102190681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 102190681 is about 10108.9406467740. The cubic root of 102190681 is about 467.5238433320.

The spelling of 102190681 in words is "one hundred two million, one hundred ninety thousand, six hundred eighty-one".