1731620641 has 4 divisors (see below), whose sum is σ = 1732095252. Its totient is φ = 1731146032.

The previous prime is 1731620587. The next prime is 1731620669. The reversal of 1731620641 is 1460261371.

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 860190241 + 871430400 = 29329^2 + 29520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1731620641 - 2⁹ = 1731620129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1731627641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231790 + ... + 239143.

It is an arithmetic number, because the mean of its divisors is an integer number (433023813).

Almost surely, 2^1731620641 is an apocalyptic number.

It is an amenable number.

1731620641 is a deficient number, since it is larger than the sum of its proper divisors (474611).

1731620641 is an equidigital number, since it uses as much as digits as its factorization.

1731620641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474610.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1731620641 is about 41612.7461362501. The cubic root of 1731620641 is about 1200.8375266642.

The spelling of 1731620641 in words is "one billion, seven hundred thirty-one million, six hundred twenty thousand, six hundred forty-one".