1648140881 has 4 divisors (see below), whose sum is σ = 1648227312. Its totient is φ = 1648054452.

The previous prime is 1648140817. The next prime is 1648140887. The reversal of 1648140881 is 1880418461.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1648140881 - 2⁶ = 1648140817 is a prime.

It is a super-2 number, since 2×1648140881² = 5432736727246912322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648140887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611 + ... + 57416.

It is an arithmetic number, because the mean of its divisors is an integer number (412056828).

Almost surely, 2^1648140881 is an apocalyptic number.

It is an amenable number.

1648140881 is a deficient number, since it is larger than the sum of its proper divisors (86431).

1648140881 is an equidigital number, since it uses as much as digits as its factorization.

1648140881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86430.

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 1648140881 is about 40597.3014004626. The cubic root of 1648140881 is about 1181.2217741322.

The spelling of 1648140881 in words is "one billion, six hundred forty-eight million, one hundred forty thousand, eight hundred eighty-one".