643151029 has 2 divisors, whose sum is σ = 643151030. Its totient is φ = 643151028.

The previous prime is 643151011. The next prime is 643151063. The reversal of 643151029 is 920151346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642622500 + 528529 = 25350^2 + 727^2 .

It is a cyclic number.

It is not a de Polignac number, because 643151029 - 2¹⁷ = 643019957 is a prime.

It is a super-2 number, since 2×643151029² = 827286492207517682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643151329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321575514 + 321575515.

It is an arithmetic number, because the mean of its divisors is an integer number (321575515).

Almost surely, 2^643151029 is an apocalyptic number.

It is an amenable number.

643151029 is a deficient number, since it is larger than the sum of its proper divisors (1).

643151029 is an equidigital number, since it uses as much as digits as its factorization.

643151029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 643151029 is about 25360.4224925375. The cubic root of 643151029 is about 863.1858708534.

The spelling of 643151029 in words is "six hundred forty-three million, one hundred fifty-one thousand, twenty-nine".