1641662413 has 2 divisors, whose sum is σ = 1641662414. Its totient is φ = 1641662412.

The previous prime is 1641662371. The next prime is 1641662431. The reversal of 1641662413 is 3142661461.

Together with next prime (1641662431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 957159844 + 684502569 = 30938^2 + 26163^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641662413 - 2²¹ = 1639565261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641662713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820831206 + 820831207.

It is an arithmetic number, because the mean of its divisors is an integer number (820831207).

Almost surely, 2^1641662413 is an apocalyptic number.

It is an amenable number.

1641662413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641662413 is an equidigital number, since it uses as much as digits as its factorization.

1641662413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 1641662413 is about 40517.4334453702. The cubic root of 1641662413 is about 1179.6720368365.

The spelling of 1641662413 in words is "one billion, six hundred forty-one million, six hundred sixty-two thousand, four hundred thirteen".