102129491 has 2 divisors, whose sum is σ = 102129492. Its totient is φ = 102129490.

The previous prime is 102129451. The next prime is 102129497. The reversal of 102129491 is 194921201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102129491 is a prime.

It is a super-5 number, since 5×102129491⁵ (a number of 41 digits) contains 55555 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102129497) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51064745 + 51064746.

It is an arithmetic number, because the mean of its divisors is an integer number (51064746).

Almost surely, 2^102129491 is an apocalyptic number.

102129491 is a deficient number, since it is larger than the sum of its proper divisors (1).

102129491 is an equidigital number, since it uses as much as digits as its factorization.

102129491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 102129491 is about 10105.9136647806. The cubic root of 102129491 is about 467.4305096557.

The spelling of 102129491 in words is "one hundred two million, one hundred twenty-nine thousand, four hundred ninety-one".