102115490857 has 2 divisors, whose sum is σ = 102115490858. Its totient is φ = 102115490856.

The previous prime is 102115490803. The next prime is 102115490881. The reversal of 102115490857 is 758094511201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77112291481 + 25003199376 = 277691^2 + 158124^2 .

It is an emirp because it is prime and its reverse (758094511201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102115490857 - 2²³ = 102107102249 is a prime.

It is not a weakly prime, because it can be changed into another prime (102115400857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51057745428 + 51057745429.

It is an arithmetic number, because the mean of its divisors is an integer number (51057745429).

Almost surely, 2^102115490857 is an apocalyptic number.

It is an amenable number.

102115490857 is a deficient number, since it is larger than the sum of its proper divisors (1).

102115490857 is an equidigital number, since it uses as much as digits as its factorization.

102115490857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 102115490857 in words is "one hundred two billion, one hundred fifteen million, four hundred ninety thousand, eight hundred fifty-seven".