643161151 has 2 divisors, whose sum is σ = 643161152. Its totient is φ = 643161150.

The previous prime is 643161139. The next prime is 643161173. The reversal of 643161151 is 151161346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643161151 - 2¹¹ = 643159103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643161251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321580575 + 321580576.

It is an arithmetic number, because the mean of its divisors is an integer number (321580576).

Almost surely, 2^643161151 is an apocalyptic number.

643161151 is a deficient number, since it is larger than the sum of its proper divisors (1).

643161151 is an equidigital number, since it uses as much as digits as its factorization.

643161151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 643161151 is about 25360.6220546737. The cubic root of 643161151 is about 863.1903991426.

The spelling of 643161151 in words is "six hundred forty-three million, one hundred sixty-one thousand, one hundred fifty-one".