1220061587 has 4 divisors (see below), whose sum is σ = 1226449536. Its totient is φ = 1213673640.

The previous prime is 1220061547. The next prime is 1220061589. The reversal of 1220061587 is 7851600221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7851600221 = 67 ⋅117188063.

It is a cyclic number.

It is not a de Polignac number, because 1220061587 - 2⁸ = 1220061331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220061589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3193688 + ... + 3194069.

It is an arithmetic number, because the mean of its divisors is an integer number (306612384).

Almost surely, 2^1220061587 is an apocalyptic number.

1220061587 is a deficient number, since it is larger than the sum of its proper divisors (6387949).

1220061587 is an equidigital number, since it uses as much as digits as its factorization.

1220061587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387948.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 1220061587 is about 34929.3799973604. The cubic root of 1220061587 is about 1068.5477100487.

The spelling of 1220061587 in words is "one billion, two hundred twenty million, sixty-one thousand, five hundred eighty-seven".