1651660441 has 4 divisors (see below), whose sum is σ = 1691944884. Its totient is φ = 1611376000.

The previous prime is 1651660393. The next prime is 1651660459. The reversal of 1651660441 is 1440661561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112275216 + 1539385225 = 10596^2 + 39235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1651660441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1651660397 and 1651660406.

It is not an unprimeable number, because it can be changed into a prime (1651660471) 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, 20142160 + ... + 20142241.

It is an arithmetic number, because the mean of its divisors is an integer number (422986221).

Almost surely, 2^1651660441 is an apocalyptic number.

It is an amenable number.

1651660441 is a deficient number, since it is larger than the sum of its proper divisors (40284443).

1651660441 is an equidigital number, since it uses as much as digits as its factorization.

1651660441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40284442.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1651660441 is about 40640.6254996155. The cubic root of 1651660441 is about 1182.0619986414.

The spelling of 1651660441 in words is "one billion, six hundred fifty-one million, six hundred sixty thousand, four hundred forty-one".