1641457 has 2 divisors, whose sum is σ = 1641458. Its totient is φ = 1641456.

The previous prime is 1641407. The next prime is 1641473. The reversal of 1641457 is 7541461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1461681 + 179776 = 1209^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641457 - 2⁷ = 1641329 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1641407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820728 + 820729.

It is an arithmetic number, because the mean of its divisors is an integer number (820729).

2^1641457 is an apocalyptic number.

It is an amenable number.

1641457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641457 is an equidigital number, since it uses as much as digits as its factorization.

1641457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 1641457 is about 1281.1935841238. The cubic root of 1641457 is about 117.9622832632.

It can be divided in two parts, 16414 and 57, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 1641457 in words is "one million, six hundred forty-one thousand, four hundred fifty-seven".