1641945953 has 2 divisors, whose sum is σ = 1641945954. Its totient is φ = 1641945952.

The previous prime is 1641945917. The next prime is 1641946067. The reversal of 1641945953 is 3595491461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232571664 + 409374289 = 35108^2 + 20233^2 .

It is an emirp because it is prime and its reverse (3595491461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641945953 - 2²² = 1637751649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1641945898 and 1641945907.

It is not a weakly prime, because it can be changed into another prime (1641945913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820972976 + 820972977.

It is an arithmetic number, because the mean of its divisors is an integer number (820972977).

Almost surely, 2^1641945953 is an apocalyptic number.

It is an amenable number.

1641945953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641945953 is an equidigital number, since it uses as much as digits as its factorization.

1641945953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 47.

The square root of 1641945953 is about 40520.9322819700. The cubic root of 1641945953 is about 1179.7399486783.

The spelling of 1641945953 in words is "one billion, six hundred forty-one million, nine hundred forty-five thousand, nine hundred fifty-three".