1649109842 has 4 divisors (see below), whose sum is σ = 2473664766. Its totient is φ = 824554920.

The previous prime is 1649109841. The next prime is 1649109857. The reversal of 1649109842 is 2489019461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2489019461 = 73 ⋅34096157.

It can be written as a sum of positive squares in only one way, i.e., 1331593081 + 317516761 = 36491^2 + 17819^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1649109793 and 1649109802.

It is not an unprimeable number, because it can be changed into a prime (1649109841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412277459 + ... + 412277462.

Almost surely, 2^1649109842 is an apocalyptic number.

1649109842 is a deficient number, since it is larger than the sum of its proper divisors (824554924).

1649109842 is an equidigital number, since it uses as much as digits as its factorization.

1649109842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824554923.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1649109842 is about 40609.2334574294. The cubic root of 1649109842 is about 1181.4532134099.

The spelling of 1649109842 in words is "one billion, six hundred forty-nine million, one hundred nine thousand, eight hundred forty-two".