1648649741 has 4 divisors (see below), whose sum is σ = 1735420800. Its totient is φ = 1561878684.

The previous prime is 1648649707. The next prime is 1648649759. The reversal of 1648649741 is 1479468461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1479468461 = 16001 ⋅92461.

It is a cyclic number.

It is not a de Polignac number, because 1648649741 - 2¹⁸ = 1648387597 is a prime.

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 1648649741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648649791) 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, 43385501 + ... + 43385538.

It is an arithmetic number, because the mean of its divisors is an integer number (433855200).

Almost surely, 2^1648649741 is an apocalyptic number.

It is an amenable number.

1648649741 is a deficient number, since it is larger than the sum of its proper divisors (86771059).

1648649741 is an equidigital number, since it uses as much as digits as its factorization.

1648649741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86771058.

The product of its digits is 1161216, while the sum is 50.

The square root of 1648649741 is about 40603.5680821280. The cubic root of 1648649741 is about 1181.3433281953.

The spelling of 1648649741 in words is "one billion, six hundred forty-eight million, six hundred forty-nine thousand, seven hundred forty-one".