1649662919 has 4 divisors (see below), whose sum is σ = 1672897680. Its totient is φ = 1626428160.

The previous prime is 1649662913. The next prime is 1649662933. The reversal of 1649662919 is 9192669461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9192669461 = 233 ⋅39453517.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649662919 is a prime.

It is a super-2 number, since 2×1649662919² = 5442775492647201122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649662913) 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, 11617274 + ... + 11617415.

It is an arithmetic number, because the mean of its divisors is an integer number (418224420).

Almost surely, 2^1649662919 is an apocalyptic number.

1649662919 is a deficient number, since it is larger than the sum of its proper divisors (23234761).

1649662919 is an equidigital number, since it uses as much as digits as its factorization.

1649662919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23234760.

The product of its digits is 1259712, while the sum is 53.

The square root of 1649662919 is about 40616.0426309605. The cubic root of 1649662919 is about 1181.5852768917.

The spelling of 1649662919 in words is "one billion, six hundred forty-nine million, six hundred sixty-two thousand, nine hundred nineteen".