102381457 has 2 divisors, whose sum is σ = 102381458. Its totient is φ = 102381456.

The previous prime is 102381449. The next prime is 102381509. The reversal of 102381457 is 754183201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 10394176 = 9591^2 + 3224^2 .

It is a cyclic number.

It is not a de Polignac number, because 102381457 - 2³ = 102381449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102381407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51190728 + 51190729.

It is an arithmetic number, because the mean of its divisors is an integer number (51190729).

Almost surely, 2^102381457 is an apocalyptic number.

It is an amenable number.

102381457 is a deficient number, since it is larger than the sum of its proper divisors (1).

102381457 is an equidigital number, since it uses as much as digits as its factorization.

102381457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 102381457 is about 10118.3722505154. The cubic root of 102381457 is about 467.8145967942.

The spelling of 102381457 in words is "one hundred two million, three hundred eighty-one thousand, four hundred fifty-seven".