1301631 has 4 divisors (see below), whose sum is σ = 1735512. Its totient is φ = 867752.

The previous prime is 1301621. The next prime is 1301669. The reversal of 1301631 is 1361031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1301631 - 2⁹ = 1301119 is a prime.

It is a super-2 number, since 2×1301631² = 3388486520322, which contains 22 as substring.

It is a D-number.

1301631 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1301631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216936 + ... + 216941.

It is an arithmetic number, because the mean of its divisors is an integer number (433878).

2^1301631 is an apocalyptic number.

1301631 is a deficient number, since it is larger than the sum of its proper divisors (433881).

1301631 is an equidigital number, since it uses as much as digits as its factorization.

1301631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433880.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1301631 is about 1140.8904417165. The cubic root of 1301631 is about 109.1849118415.

Adding to 1301631 its reverse (1361031), we get a palindrome (2662662).

The spelling of 1301631 in words is "one million, three hundred one thousand, six hundred thirty-one".