1213431 has 8 divisors (see below), whose sum is σ = 1623024. Its totient is φ = 806400.

The previous prime is 1213427. The next prime is 1213439. The reversal of 1213431 is 1343121.

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

It is not a de Polignac number, because 1213431 - 2² = 1213427 is a prime.

It is a super-2 number, since 2×1213431² = 2944829583522, which contains 22 as substring.

1213431 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213439) 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, 1381 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (202878).

2^1213431 is an apocalyptic number.

1213431 is a deficient number, since it is larger than the sum of its proper divisors (409593).

1213431 is an equidigital number, since it uses as much as digits as its factorization.

1213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281.

The product of its digits is 72, while the sum is 15.

The square root of 1213431 is about 1101.5584414819. The cubic root of 1213431 is about 106.6608471217.

Adding to 1213431 its reverse (1343121), we get a palindrome (2556552).

The spelling of 1213431 in words is "one million, two hundred thirteen thousand, four hundred thirty-one".