128487971 has 2 divisors, whose sum is σ = 128487972. Its totient is φ = 128487970.

The previous prime is 128487949. The next prime is 128487991. The reversal of 128487971 is 179784821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128487971 - 2¹⁴ = 128471587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128487941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64243985 + 64243986.

It is an arithmetic number, because the mean of its divisors is an integer number (64243986).

Almost surely, 2^128487971 is an apocalyptic number.

128487971 is a deficient number, since it is larger than the sum of its proper divisors (1).

128487971 is an equidigital number, since it uses as much as digits as its factorization.

128487971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 47.

The square root of 128487971 is about 11335.2534598923. The cubic root of 128487971 is about 504.6080296631.

The spelling of 128487971 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, nine hundred seventy-one".