1646642029 has 2 divisors, whose sum is σ = 1646642030. Its totient is φ = 1646642028.

The previous prime is 1646641999. The next prime is 1646642047. The reversal of 1646642029 is 9202466461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152602500 + 494039529 = 33950^2 + 22227^2 .

It is an emirp because it is prime and its reverse (9202466461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1646642029 - 2¹³ = 1646633837 is a prime.

It is a super-2 number, since 2×1646642029² = 5422859943338473682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646641982 and 1646642000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646642099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823321014 + 823321015.

It is an arithmetic number, because the mean of its divisors is an integer number (823321015).

Almost surely, 2^1646642029 is an apocalyptic number.

It is an amenable number.

1646642029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646642029 is an equidigital number, since it uses as much as digits as its factorization.

1646642029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 1646642029 is about 40578.8372061103. The cubic root of 1646642029 is about 1180.8635900286.

The spelling of 1646642029 in words is "one billion, six hundred forty-six million, six hundred forty-two thousand, twenty-nine".