1771397 has 2 divisors, whose sum is σ = 1771398. Its totient is φ = 1771396.

The previous prime is 1771387. The next prime is 1771411. The reversal of 1771397 is 7931771.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1515361 + 256036 = 1231^2 + 506^2 .

It is an emirp because it is prime and its reverse (7931771) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1771397 - 2¹⁶ = 1705861 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1771327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 885698 + 885699.

It is an arithmetic number, because the mean of its divisors is an integer number (885699).

2^1771397 is an apocalyptic number.

It is an amenable number.

1771397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1771397 is an equidigital number, since it uses as much as digits as its factorization.

1771397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9261, while the sum is 35.

The square root of 1771397 is about 1330.9383907604. The cubic root of 1771397 is about 120.9962660779.

The spelling of 1771397 in words is "one million, seven hundred seventy-one thousand, three hundred ninety-seven".