1649699969 has 2 divisors, whose sum is σ = 1649699970. Its totient is φ = 1649699968.

The previous prime is 1649699959. The next prime is 1649699971. The reversal of 1649699969 is 9699969461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1643248369 + 6451600 = 40537^2 + 2540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649699969 is a prime.

It is a super-2 number, since 2×1649699969² = 5443019975437201922, which contains 22 as substring.

Together with 1649699971, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1649699899 and 1649699908.

It is not a weakly prime, because it can be changed into another prime (1649699959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824849984 + 824849985.

It is an arithmetic number, because the mean of its divisors is an integer number (824849985).

Almost surely, 2^1649699969 is an apocalyptic number.

It is an amenable number.

1649699969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649699969 is an equidigital number, since it uses as much as digits as its factorization.

1649699969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51018336, while the sum is 68.

The square root of 1649699969 is about 40616.4987289648. The cubic root of 1649699969 is about 1181.5941226194.

The spelling of 1649699969 in words is "one billion, six hundred forty-nine million, six hundred ninety-nine thousand, nine hundred sixty-nine".