128979637 has 2 divisors, whose sum is σ = 128979638. Its totient is φ = 128979636.

The previous prime is 128979589. The next prime is 128979647. The reversal of 128979637 is 736979821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68046001 + 60933636 = 8249^2 + 7806^2 .

It is an emirp because it is prime and its reverse (736979821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128979637 - 2⁷ = 128979509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128979647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64489818 + 64489819.

It is an arithmetic number, because the mean of its divisors is an integer number (64489819).

Almost surely, 2^128979637 is an apocalyptic number.

It is an amenable number.

128979637 is a deficient number, since it is larger than the sum of its proper divisors (1).

128979637 is an equidigital number, since it uses as much as digits as its factorization.

128979637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 128979637 is about 11356.9202251315. The cubic root of 128979637 is about 505.2508468505.

The spelling of 128979637 in words is "one hundred twenty-eight million, nine hundred seventy-nine thousand, six hundred thirty-seven".