1697109649 has 2 divisors, whose sum is σ = 1697109650. Its totient is φ = 1697109648.

The previous prime is 1697109647. The next prime is 1697109653. The reversal of 1697109649 is 9469017961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1300900624 + 396209025 = 36068^2 + 19905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1697109649 - 2¹ = 1697109647 is a prime.

Together with 1697109647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1697109596 and 1697109605.

It is not a weakly prime, because it can be changed into another prime (1697109647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 848554824 + 848554825.

It is an arithmetic number, because the mean of its divisors is an integer number (848554825).

Almost surely, 2^1697109649 is an apocalyptic number.

It is an amenable number.

1697109649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1697109649 is an equidigital number, since it uses as much as digits as its factorization.

1697109649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1697109649 is about 41195.9906908427. The cubic root of 1697109649 is about 1192.8064189492.

The spelling of 1697109649 in words is "one billion, six hundred ninety-seven million, one hundred nine thousand, six hundred forty-nine".