1220106887 has 4 divisors (see below), whose sum is σ = 1246066656. Its totient is φ = 1194147120.

The previous prime is 1220106871. The next prime is 1220106941. The reversal of 1220106887 is 7886010221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7886010221 = 613 ⋅12864617.

It is a cyclic number.

It is not a de Polignac number, because 1220106887 - 2⁴ = 1220106871 is a prime.

It is a super-4 number, since 4×1220106887⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220109887) 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, 12979814 + ... + 12979907.

It is an arithmetic number, because the mean of its divisors is an integer number (311516664).

Almost surely, 2^1220106887 is an apocalyptic number.

1220106887 is a deficient number, since it is larger than the sum of its proper divisors (25959769).

1220106887 is an equidigital number, since it uses as much as digits as its factorization.

1220106887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25959768.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 1220106887 is about 34930.0284425879. The cubic root of 1220106887 is about 1068.5609346849.

The spelling of 1220106887 in words is "one billion, two hundred twenty million, one hundred six thousand, eight hundred eighty-seven".