1220281587 has 12 divisors (see below), whose sum is σ = 2014433200. Its totient is φ = 697303728.

The previous prime is 1220281577. The next prime is 1220281589. The reversal of 1220281587 is 7851820221.

It is not a de Polignac number, because 1220281587 - 2⁶ = 1220281523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220281589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9684712 + ... + 9684837.

Almost surely, 2^1220281587 is an apocalyptic number.

1220281587 is a deficient number, since it is larger than the sum of its proper divisors (794151613).

1220281587 is a wasteful number, since it uses less digits than its factorization.

1220281587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19369562 (or 19369559 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 1220281587 is about 34932.5290667595. The cubic root of 1220281587 is about 1068.6119325902.

The spelling of 1220281587 in words is "one billion, two hundred twenty million, two hundred eighty-one thousand, five hundred eighty-seven".