1220534687 has 4 divisors (see below), whose sum is σ = 1262622120. Its totient is φ = 1178447256.

The previous prime is 1220534683. The next prime is 1220534701. The reversal of 1220534687 is 7864350221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220534687 - 2² = 1220534683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220534687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220534683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21043673 + ... + 21043730.

It is an arithmetic number, because the mean of its divisors is an integer number (315655530).

Almost surely, 2^1220534687 is an apocalyptic number.

1220534687 is a deficient number, since it is larger than the sum of its proper divisors (42087433).

1220534687 is an equidigital number, since it uses as much as digits as its factorization.

1220534687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42087432.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1220534687 is about 34936.1515768409. The cubic root of 1220534687 is about 1068.6858081574.

It can be divided in two parts, 1220534 and 687, that added together give a palindrome (1221221).

The spelling of 1220534687 in words is "one billion, two hundred twenty million, five hundred thirty-four thousand, six hundred eighty-seven".