1958641 has 2 divisors, whose sum is σ = 1958642. Its totient is φ = 1958640.

The previous prime is 1958639. The next prime is 1958651. The reversal of 1958641 is 1468591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008016 + 950625 = 1004^2 + 975^2 .

It is an emirp because it is prime and its reverse (1468591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1958641 - 2¹ = 1958639 is a prime.

Together with 1958639, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1958597 and 1958606.

It is not a weakly prime, because it can be changed into another prime (1958651) 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, 979320 + 979321.

It is an arithmetic number, because the mean of its divisors is an integer number (979321).

2^1958641 is an apocalyptic number.

It is an amenable number.

1958641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958641 is an equidigital number, since it uses as much as digits as its factorization.

1958641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 1958641 is about 1399.5145586953. The cubic root of 1958641 is about 125.1175640615.

It can be divided in two parts, 195 and 8641, that added together give a square (8836 = 94²).

The spelling of 1958641 in words is "one million, nine hundred fifty-eight thousand, six hundred forty-one".