102378257 has 2 divisors, whose sum is σ = 102378258. Its totient is φ = 102378256.

The previous prime is 102378253. The next prime is 102378277. The reversal of 102378257 is 752873201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98089216 + 4289041 = 9904^2 + 2071^2 .

It is a cyclic number.

It is not a de Polignac number, because 102378257 - 2² = 102378253 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102378253) 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, 51189128 + 51189129.

It is an arithmetic number, because the mean of its divisors is an integer number (51189129).

Almost surely, 2^102378257 is an apocalyptic number.

It is an amenable number.

102378257 is a deficient number, since it is larger than the sum of its proper divisors (1).

102378257 is an equidigital number, since it uses as much as digits as its factorization.

102378257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 102378257 is about 10118.2141210789. The cubic root of 102378257 is about 467.8097227922.

The spelling of 102378257 in words is "one hundred two million, three hundred seventy-eight thousand, two hundred fifty-seven".