1640169029 has 2 divisors, whose sum is σ = 1640169030. Its totient is φ = 1640169028.

The previous prime is 1640168989. The next prime is 1640169067. The reversal of 1640169029 is 9209610461.

It is an a-pointer prime, because the next prime (1640169067) can be obtained adding 1640169029 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1426950625 + 213218404 = 37775^2 + 14602^2 .

It is an emirp because it is prime and its reverse (9209610461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640169029 - 2²⁴ = 1623391813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640168983 and 1640169001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640169079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820084514 + 820084515.

It is an arithmetic number, because the mean of its divisors is an integer number (820084515).

Almost surely, 2^1640169029 is an apocalyptic number.

It is an amenable number.

1640169029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640169029 is an equidigital number, since it uses as much as digits as its factorization.

1640169029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1640169029 is about 40499.0003456875. Note that the first 3 decimals coincide. The cubic root of 1640169029 is about 1179.3142211258.

The spelling of 1640169029 in words is "one billion, six hundred forty million, one hundred sixty-nine thousand, twenty-nine".