1620497 has 2 divisors, whose sum is σ = 1620498. Its totient is φ = 1620496.

The previous prime is 1620469. The next prime is 1620517. The reversal of 1620497 is 7940261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597696 + 22801 = 1264^2 + 151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620497 - 2¹⁰ = 1619473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1620467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810248 + 810249.

It is an arithmetic number, because the mean of its divisors is an integer number (810249).

2^1620497 is an apocalyptic number.

It is an amenable number.

1620497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620497 is an equidigital number, since it uses as much as digits as its factorization.

1620497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1620497 is about 1272.9874312027. The cubic root of 1620497 is about 117.4580384343.

The spelling of 1620497 in words is "one million, six hundred twenty thousand, four hundred ninety-seven".