1220631 has 8 divisors (see below), whose sum is σ = 1632624. Its totient is φ = 811200.

The previous prime is 1220623. The next prime is 1220657. The reversal of 1220631 is 1360221.

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

It is not a de Polignac number, because 1220631 - 2³ = 1220623 is a prime.

It is a super-2 number, since 2×1220631² = 2979880076322, which contains 22 as substring.

1220631 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221631) 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, 1465 + ... + 2141.

It is an arithmetic number, because the mean of its divisors is an integer number (204078).

2^1220631 is an apocalyptic number.

1220631 is a deficient number, since it is larger than the sum of its proper divisors (411993).

1220631 is an equidigital number, since it uses as much as digits as its factorization.

1220631 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 (nonzero) digits is 72, while the sum is 15.

The square root of 1220631 is about 1104.8217050728. The cubic root of 1220631 is about 106.8713917594.

Adding to 1220631 its product of nonzero digits (72), we get a triangular number (1220703 = T₁₅₆₂).

Adding to 1220631 its reverse (1360221), we get a palindrome (2580852).

The spelling of 1220631 in words is "one million, two hundred twenty thousand, six hundred thirty-one".