1221031 has 6 divisors (see below), whose sum is σ = 1420440. Its totient is φ = 1046556.

The previous prime is 1221029. The next prime is 1221049. The reversal of 1221031 is 1301221.

It is not a de Polignac number, because 1221031 - 2¹ = 1221029 is a prime.

It is a super-2 number, since 2×1221031² = 2981833405922, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1220999 and 1221017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12411 + ... + 12508.

It is an arithmetic number, because the mean of its divisors is an integer number (236740).

2^1221031 is an apocalyptic number.

1221031 is a deficient number, since it is larger than the sum of its proper divisors (199409).

1221031 is an equidigital number, since it uses as much as digits as its factorization.

1221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24933 (or 24926 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1221031 is about 1105.0027149288. The cubic root of 1221031 is about 106.8830643801.

Adding to 1221031 its reverse (1301221), we get a palindrome (2522252).

The spelling of 1221031 in words is "one million, two hundred twenty-one thousand, thirty-one".