1220531634 has 24 divisors (see below), whose sum is σ = 3022269120. Its totient is φ = 348723288.

The previous prime is 1220531621. The next prime is 1220531657. The reversal of 1220531634 is 4361350221.

1220531634 is a `hidden beast` number, since 1 + 2 + 20 + 5 + 3 + 1 + 634 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1220531598 and 1220531607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4843254 + ... + 4843505.

It is an arithmetic number, because the mean of its divisors is an integer number (125927880).

Almost surely, 2^1220531634 is an apocalyptic number.

1220531634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1220531634 is an abundant number, since it is smaller than the sum of its proper divisors (1801737486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220531634 is a wasteful number, since it uses less digits than its factorization.

1220531634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686774 (or 9686771 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1220531634 is about 34936.1078828195. The cubic root of 1220531634 is about 1068.6849170997.

Adding to 1220531634 its reverse (4361350221), we get a palindrome (5581881855).

The spelling of 1220531634 in words is "one billion, two hundred twenty million, five hundred thirty-one thousand, six hundred thirty-four".