1641143969 has 2 divisors, whose sum is σ = 1641143970. Its totient is φ = 1641143968.

The previous prime is 1641143947. The next prime is 1641143971. The reversal of 1641143969 is 9693411461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1382352400 + 258791569 = 37180^2 + 16087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641143969 is a prime.

It is a super-2 number, since 2×1641143969² = 5386707053970145922, which contains 22 as substring.

Together with 1641143971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1641143989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820571984 + 820571985.

It is an arithmetic number, because the mean of its divisors is an integer number (820571985).

Almost surely, 2^1641143969 is an apocalyptic number.

It is an amenable number.

1641143969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641143969 is an equidigital number, since it uses as much as digits as its factorization.

1641143969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 1641143969 is about 40511.0351509314. The cubic root of 1641143969 is about 1179.5478419397.

The spelling of 1641143969 in words is "one billion, six hundred forty-one million, one hundred forty-three thousand, nine hundred sixty-nine".