53128139 has 2 divisors, whose sum is σ = 53128140. Its totient is φ = 53128138.

The previous prime is 53128109. The next prime is 53128147. The reversal of 53128139 is 93182135.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53128139 - 2⁸ = 53127883 is a prime.

It is a Sophie Germain prime.

It is equal to p_3177239 and since 53128139 and 3177239 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (53128109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26564069 + 26564070.

It is an arithmetic number, because the mean of its divisors is an integer number (26564070).

Almost surely, 2^53128139 is an apocalyptic number.

53128139 is a deficient number, since it is larger than the sum of its proper divisors (1).

53128139 is an equidigital number, since it uses as much as digits as its factorization.

53128139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 53128139 is about 7288.9051989994. The cubic root of 53128139 is about 375.9310529797.

The spelling of 53128139 in words is "fifty-three million, one hundred twenty-eight thousand, one hundred thirty-nine".