1945487669 has 2 divisors, whose sum is σ = 1945487670. Its totient is φ = 1945487668.

The previous prime is 1945487651. The next prime is 1945487711. The reversal of 1945487669 is 9667845491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1719346225 + 226141444 = 41465^2 + 15038^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945487669 - 2⁸ = 1945487413 is a prime.

It is a super-2 number, since 2×1945487669² = 7569844540462107122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945484669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972743834 + 972743835.

It is an arithmetic number, because the mean of its divisors is an integer number (972743835).

Almost surely, 2^1945487669 is an apocalyptic number.

It is an amenable number.

1945487669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945487669 is an equidigital number, since it uses as much as digits as its factorization.

1945487669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 59.

The square root of 1945487669 is about 44107.6826527987. The cubic root of 1945487669 is about 1248.3685744067.

The spelling of 1945487669 in words is "one billion, nine hundred forty-five million, four hundred eighty-seven thousand, six hundred sixty-nine".