1648634491 has 16 divisors (see below), whose sum is σ = 1937827584. Its totient is φ = 1373196384.

The previous prime is 1648634453. The next prime is 1648634509. The reversal of 1648634491 is 1944368461.

It is not a de Polignac number, because 1648634491 - 2⁹ = 1648633979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648634401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45396 + ... + 73198.

It is an arithmetic number, because the mean of its divisors is an integer number (121114224).

Almost surely, 2^1648634491 is an apocalyptic number.

1648634491 is a deficient number, since it is larger than the sum of its proper divisors (289193093).

1648634491 is a wasteful number, since it uses less digits than its factorization.

1648634491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28050.

The product of its digits is 497664, while the sum is 46.

The square root of 1648634491 is about 40603.3802903157. The cubic root of 1648634491 is about 1181.3396857112.

The spelling of 1648634491 in words is "one billion, six hundred forty-eight million, six hundred thirty-four thousand, four hundred ninety-one".