1213131 has 8 divisors (see below), whose sum is σ = 1702720. Its totient is φ = 766152.

The previous prime is 1213129. The next prime is 1213133. The reversal of 1213131 is 1313121.

It is an interprime number because it is at equal distance from previous prime (1213129) and next prime (1213133).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213131 - 2¹ = 1213129 is a prime.

It is a super-2 number, since 2×1213131² = 2943373646322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10585 + ... + 10698.

It is an arithmetic number, because the mean of its divisors is an integer number (212840).

2^1213131 is an apocalyptic number.

1213131 is a deficient number, since it is larger than the sum of its proper divisors (489589).

1213131 is a wasteful number, since it uses less digits than its factorization.

1213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21305.

The product of its digits is 18, while the sum is 12.

The square root of 1213131 is about 1101.4222623499. The cubic root of 1213131 is about 106.6520563756.

Adding to 1213131 its reverse (1313121), we get a palindrome (2526252).

The spelling of 1213131 in words is "one million, two hundred thirteen thousand, one hundred thirty-one".