1220531 has 4 divisors (see below), whose sum is σ = 1314432. Its totient is φ = 1126632.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220531 is 1350221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1350221 = 809 ⋅1669.

It is not a de Polignac number, because 1220531 - 2¹⁰ = 1219507 is a prime.

It is a super-2 number, since 2×1220531² = 2979391843922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220591) 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, 46931 + ... + 46956.

It is an arithmetic number, because the mean of its divisors is an integer number (328608).

2^1220531 is an apocalyptic number.

1220531 is a deficient number, since it is larger than the sum of its proper divisors (93901).

1220531 is an equidigital number, since it uses as much as digits as its factorization.

1220531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93900.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1220531 is about 1104.7764479749. The cubic root of 1220531 is about 106.8684732058.

Adding to 1220531 its reverse (1350221), we get a palindrome (2570752).

The spelling of 1220531 in words is "one million, two hundred twenty thousand, five hundred thirty-one".