1220031 has 6 divisors (see below), whose sum is σ = 1762280. Its totient is φ = 813348.

The previous prime is 1220029. The next prime is 1220041. The reversal of 1220031 is 1300221.

1220031 = 123² + 124² + ... + 176².

It is a happy number.

It is not a de Polignac number, because 1220031 - 2¹ = 1220029 is a prime.

It is a super-2 number, since 2×1220031² = 2976951281922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 135559 = 1220031 / (1 + 2 + 2 + 0 + 0 + 3 + 1).

It is a Duffinian number.

1220031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1219995 and 1220022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220041) 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, 67771 + ... + 67788.

2^1220031 is an apocalyptic number.

1220031 is a deficient number, since it is larger than the sum of its proper divisors (542249).

1220031 is a wasteful number, since it uses less digits than its factorization.

1220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135565 (or 135562 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1220031 is about 1104.5501346702. The cubic root of 1220031 is about 106.8538780461.

Adding to 1220031 its reverse (1300221), we get a palindrome (2520252).

The spelling of 1220031 in words is "one million, two hundred twenty thousand, thirty-one".