1649148569 has 4 divisors (see below), whose sum is σ = 1652871696. Its totient is φ = 1645425444.

The previous prime is 1649148499. The next prime is 1649148619. The reversal of 1649148569 is 9658419461.

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 not a de Polignac number, because 1649148569 - 2¹² = 1649144473 is a prime.

It is a super-2 number, since 2×1649148569² = 5439382005269495522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1649148569.

It is not an unprimeable number, because it can be changed into a prime (1649148469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860899 + ... + 1861784.

It is an arithmetic number, because the mean of its divisors is an integer number (413217924).

Almost surely, 2^1649148569 is an apocalyptic number.

It is an amenable number.

1649148569 is a deficient number, since it is larger than the sum of its proper divisors (3723127).

1649148569 is an equidigital number, since it uses as much as digits as its factorization.

1649148569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723126.

The product of its digits is 1866240, while the sum is 53.

The square root of 1649148569 is about 40609.7102796856. The cubic root of 1649148569 is about 1181.4624615871.

The spelling of 1649148569 in words is "one billion, six hundred forty-nine million, one hundred forty-eight thousand, five hundred sixty-nine".