1631297 has 2 divisors, whose sum is σ = 1631298. Its totient is φ = 1631296.

The previous prime is 1631263. The next prime is 1631299. The reversal of 1631297 is 7921361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1401856 + 229441 = 1184^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631297 - 2¹⁰ = 1630273 is a prime.

It is a super-2 number, since 2×1631297² = 5322259804418, which contains 22 as substring.

Together with 1631299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1631299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815648 + 815649.

It is an arithmetic number, because the mean of its divisors is an integer number (815649).

2^1631297 is an apocalyptic number.

It is an amenable number.

1631297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631297 is an equidigital number, since it uses as much as digits as its factorization.

1631297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 1631297 is about 1277.2223768788. Note that the first 3 decimals coincide. The cubic root of 1631297 is about 117.7183986972.

Subtracting 1631297 from its reverse (7921361), we obtain a square (6290064 = 2508²).

It can be divided in two parts, 16 and 31297, that added together give a palindrome (31313).

The spelling of 1631297 in words is "one million, six hundred thirty-one thousand, two hundred ninety-seven".