128532949 has 2 divisors, whose sum is σ = 128532950. Its totient is φ = 128532948.

The previous prime is 128532907. The next prime is 128532953. The reversal of 128532949 is 949235821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104346225 + 24186724 = 10215^2 + 4918^2 .

It is a cyclic number.

It is not a de Polignac number, because 128532949 - 2¹³ = 128524757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128533949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64266474 + 64266475.

It is an arithmetic number, because the mean of its divisors is an integer number (64266475).

Almost surely, 2^128532949 is an apocalyptic number.

It is an amenable number.

128532949 is a deficient number, since it is larger than the sum of its proper divisors (1).

128532949 is an equidigital number, since it uses as much as digits as its factorization.

128532949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 128532949 is about 11337.2372736924. The cubic root of 128532949 is about 504.6669031695. Note that the first 3 decimals are identical.

The spelling of 128532949 in words is "one hundred twenty-eight million, five hundred thirty-two thousand, nine hundred forty-nine".