1631797 has 2 divisors, whose sum is σ = 1631798. Its totient is φ = 1631796.

The previous prime is 1631783. The next prime is 1631821. The reversal of 1631797 is 7971361.

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., 1052676 + 579121 = 1026^2 + 761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631797 is a prime.

It is a super-2 number, since 2×1631797² = 5325522898418, which contains 22 as substring.

1631797 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631297) 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, 815898 + 815899.

It is an arithmetic number, because the mean of its divisors is an integer number (815899).

2^1631797 is an apocalyptic number.

It is an amenable number.

1631797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631797 is an equidigital number, since it uses as much as digits as its factorization.

1631797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 34.

The square root of 1631797 is about 1277.4180991359. The cubic root of 1631797 is about 117.7304245447.

It can be divided in two parts, 16 and 31797, that added together give a palindrome (31813).

The spelling of 1631797 in words is "one million, six hundred thirty-one thousand, seven hundred ninety-seven".