1641754657 has 2 divisors, whose sum is σ = 1641754658. Its totient is φ = 1641754656.

The previous prime is 1641754649. The next prime is 1641754669. The reversal of 1641754657 is 7564571461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1067720976 + 574033681 = 32676^2 + 23959^2 .

It is an emirp because it is prime and its reverse (7564571461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641754657 - 2³ = 1641754649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641754627) 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 as a sum of consecutive naturals, namely, 820877328 + 820877329.

It is an arithmetic number, because the mean of its divisors is an integer number (820877329).

Almost surely, 2^1641754657 is an apocalyptic number.

It is an amenable number.

1641754657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641754657 is an equidigital number, since it uses as much as digits as its factorization.

1641754657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The square root of 1641754657 is about 40518.5717541969. The cubic root of 1641754657 is about 1179.6941314378.

The spelling of 1641754657 in words is "one billion, six hundred forty-one million, seven hundred fifty-four thousand, six hundred fifty-seven".