102420077 has 2 divisors, whose sum is σ = 102420078. Its totient is φ = 102420076.

The previous prime is 102420061. The next prime is 102420119. The reversal of 102420077 is 770024201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95628841 + 6791236 = 9779^2 + 2606^2 .

It is a cyclic number.

It is not a de Polignac number, because 102420077 - 2⁴ = 102420061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102420277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51210038 + 51210039.

It is an arithmetic number, because the mean of its divisors is an integer number (51210039).

Almost surely, 2^102420077 is an apocalyptic number.

It is an amenable number.

102420077 is a deficient number, since it is larger than the sum of its proper divisors (1).

102420077 is an equidigital number, since it uses as much as digits as its factorization.

102420077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 102420077 is about 10120.2804803029. The cubic root of 102420077 is about 467.8734118994.

Adding to 102420077 its reverse (770024201), we get a palindrome (872444278).

The spelling of 102420077 in words is "one hundred two million, four hundred twenty thousand, seventy-seven".