128918047 has 2 divisors, whose sum is σ = 128918048. Its totient is φ = 128918046.

The previous prime is 128918029. The next prime is 128918051. The reversal of 128918047 is 740819821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128918047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128918077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64459023 + 64459024.

It is an arithmetic number, because the mean of its divisors is an integer number (64459024).

Almost surely, 2^128918047 is an apocalyptic number.

128918047 is a deficient number, since it is larger than the sum of its proper divisors (1).

128918047 is an equidigital number, since it uses as much as digits as its factorization.

128918047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128918047 is about 11354.2083387614. The cubic root of 128918047 is about 505.1704120499.

The spelling of 128918047 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, forty-seven".