1649879099 has 18 divisors (see below), whose sum is σ = 1855433412. Its totient is φ = 1454943600.

The previous prime is 1649879089. The next prime is 1649879113. The reversal of 1649879099 is 9909789461.

It is a happy number.

It is not a de Polignac number, because 1649879099 - 2¹⁶ = 1649813563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649879039) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4984364 + ... + 4984694.

It is an arithmetic number, because the mean of its divisors is an integer number (103079634).

Almost surely, 2^1649879099 is an apocalyptic number.

1649879099 is a deficient number, since it is larger than the sum of its proper divisors (205554313).

1649879099 is an frugal number, since it uses more digits than its factorization.

1649879099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 1649879099 is about 40618.7038074826. The cubic root of 1649879099 is about 1181.6368882331.

The spelling of 1649879099 in words is "one billion, six hundred forty-nine million, eight hundred seventy-nine thousand, ninety-nine".