128523047 has 2 divisors, whose sum is σ = 128523048. Its totient is φ = 128523046.

The previous prime is 128523037. The next prime is 128523053. The reversal of 128523047 is 740325821.

It is a strong prime.

It is an emirp because it is prime and its reverse (740325821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128523047 is a prime.

It is a super-2 number, since 2×128523047² = 33036347220328418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128523037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64261523 + 64261524.

It is an arithmetic number, because the mean of its divisors is an integer number (64261524).

Almost surely, 2^128523047 is an apocalyptic number.

128523047 is a deficient number, since it is larger than the sum of its proper divisors (1).

128523047 is an equidigital number, since it uses as much as digits as its factorization.

128523047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 128523047 is about 11336.8005627690. The cubic root of 128523047 is about 504.6539432241.

Adding to 128523047 its reverse (740325821), we get a palindrome (868848868).

The spelling of 128523047 in words is "one hundred twenty-eight million, five hundred twenty-three thousand, forty-seven".