1620957841 has 4 divisors (see below), whose sum is σ = 1621038400. Its totient is φ = 1620877284.

The previous prime is 1620957817. The next prime is 1620957847. The reversal of 1620957841 is 1487590261.

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 1620957841 - 2⁹ = 1620957329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620957847) 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, 18340 + ... + 59818.

It is an arithmetic number, because the mean of its divisors is an integer number (405259600).

Almost surely, 2^1620957841 is an apocalyptic number.

It is an amenable number.

1620957841 is a deficient number, since it is larger than the sum of its proper divisors (80559).

1620957841 is an equidigital number, since it uses as much as digits as its factorization.

1620957841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80558.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1620957841 is about 40261.1207121709. The cubic root of 1620957841 is about 1174.6917171617.

The spelling of 1620957841 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, eight hundred forty-one".