75857129 has 2 divisors, whose sum is σ = 75857130. Its totient is φ = 75857128.

The previous prime is 75857123. The next prime is 75857137. The reversal of 75857129 is 92175857.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64432729 + 11424400 = 8027^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 75857129 - 2⁴ = 75857113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75857129.

It is not a weakly prime, because it can be changed into another prime (75857123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37928564 + 37928565.

It is an arithmetic number, because the mean of its divisors is an integer number (37928565).

Almost surely, 2^75857129 is an apocalyptic number.

It is an amenable number.

75857129 is a deficient number, since it is larger than the sum of its proper divisors (1).

75857129 is an equidigital number, since it uses as much as digits as its factorization.

75857129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 44.

The square root of 75857129 is about 8709.5998185910. The cubic root of 75857129 is about 423.3167637028.

The spelling of 75857129 in words is "seventy-five million, eight hundred fifty-seven thousand, one hundred twenty-nine".