128862361 has 2 divisors, whose sum is σ = 128862362. Its totient is φ = 128862360.

The previous prime is 128862359. The next prime is 128862449. The reversal of 128862361 is 163268821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122766400 + 6095961 = 11080^2 + 2469^2 .

It is a cyclic number.

It is not a de Polignac number, because 128862361 - 2¹ = 128862359 is a prime.

Together with 128862359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128862361.

It is not a weakly prime, because it can be changed into another prime (128862661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64431180 + 64431181.

It is an arithmetic number, because the mean of its divisors is an integer number (64431181).

Almost surely, 2^128862361 is an apocalyptic number.

It is an amenable number.

128862361 is a deficient number, since it is larger than the sum of its proper divisors (1).

128862361 is an equidigital number, since it uses as much as digits as its factorization.

128862361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 128862361 is about 11351.7558553732. The cubic root of 128862361 is about 505.0976656512.

The spelling of 128862361 in words is "one hundred twenty-eight million, eight hundred sixty-two thousand, three hundred sixty-one".