1220170631 has 16 divisors (see below), whose sum is σ = 1353003264. Its totient is φ = 1094484864.

The previous prime is 1220170613. The next prime is 1220170643. The reversal of 1220170631 is 1360710221.

It is a cyclic number.

It is not a de Polignac number, because 1220170631 - 2²² = 1215976327 is a prime.

It is a super-2 number, since 2×1220170631² = 2977632737509876322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220170597 and 1220170606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220175631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105140 + ... + 116166.

It is an arithmetic number, because the mean of its divisors is an integer number (84562704).

Almost surely, 2^1220170631 is an apocalyptic number.

1220170631 is a deficient number, since it is larger than the sum of its proper divisors (132832633).

1220170631 is a wasteful number, since it uses less digits than its factorization.

1220170631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11350.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1220170631 is about 34930.9408834059. The cubic root of 1220170631 is about 1068.5795432082.

Adding to 1220170631 its reverse (1360710221), we get a palindrome (2580880852).

The spelling of 1220170631 in words is "one billion, two hundred twenty million, one hundred seventy thousand, six hundred thirty-one".