1201631 has 4 divisors (see below), whose sum is σ = 1203912. Its totient is φ = 1199352.

The previous prime is 1201601. The next prime is 1201633. The reversal of 1201631 is 1361021.

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 1201631 - 2⁶ = 1201567 is a prime.

It is a super-2 number, since 2×1201631² = 2887834120322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (300978).

2^1201631 is an apocalyptic number.

1201631 is a deficient number, since it is larger than the sum of its proper divisors (2281).

1201631 is an equidigital number, since it uses as much as digits as its factorization.

1201631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1201631 is about 1096.1893084682. The cubic root of 1201631 is about 106.3139794595.

Adding to 1201631 its reverse (1361021), we get a palindrome (2562652).

The spelling of 1201631 in words is "one million, two hundred one thousand, six hundred thirty-one".