643125127 has 2 divisors, whose sum is σ = 643125128. Its totient is φ = 643125126.

The previous prime is 643125089. The next prime is 643125137. The reversal of 643125127 is 721521346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643125127 is a prime.

It is a super-2 number, since 2×643125127² = 827219857957532258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643125137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321562563 + 321562564.

It is an arithmetic number, because the mean of its divisors is an integer number (321562564).

Almost surely, 2^643125127 is an apocalyptic number.

643125127 is a deficient number, since it is larger than the sum of its proper divisors (1).

643125127 is an equidigital number, since it uses as much as digits as its factorization.

643125127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 643125127 is about 25359.9118097836. The cubic root of 643125127 is about 863.1742828336.

The spelling of 643125127 in words is "six hundred forty-three million, one hundred twenty-five thousand, one hundred twenty-seven".