1697488649 has 4 divisors (see below), whose sum is σ = 1697739264. Its totient is φ = 1697238036.

The previous prime is 1697488643. The next prime is 1697488673. The reversal of 1697488649 is 9468847961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1697488649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1697488591 and 1697488600.

It is not an unprimeable number, because it can be changed into a prime (1697488643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114857 + ... + 128790.

It is an arithmetic number, because the mean of its divisors is an integer number (424434816).

Almost surely, 2^1697488649 is an apocalyptic number.

It is an amenable number.

1697488649 is a deficient number, since it is larger than the sum of its proper divisors (250615).

1697488649 is an equidigital number, since it uses as much as digits as its factorization.

1697488649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250614.

The product of its digits is 20901888, while the sum is 62.

The square root of 1697488649 is about 41200.5903962552. The cubic root of 1697488649 is about 1192.8952051952.

The spelling of 1697488649 in words is "one billion, six hundred ninety-seven million, four hundred eighty-eight thousand, six hundred forty-nine".