1220455101 has 16 divisors (see below), whose sum is σ = 1759217600. Its totient is φ = 749979648.

The previous prime is 1220455097. The next prime is 1220455127. The reversal of 1220455101 is 1015540221.

It is not a de Polignac number, because 1220455101 - 2² = 1220455097 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220455501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287236 + ... + 291453.

It is an arithmetic number, because the mean of its divisors is an integer number (109951100).

Almost surely, 2^1220455101 is an apocalyptic number.

It is an amenable number.

1220455101 is a deficient number, since it is larger than the sum of its proper divisors (538762499).

1220455101 is a wasteful number, since it uses less digits than its factorization.

1220455101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578748.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1220455101 is about 34935.0125375675. The cubic root of 1220455101 is about 1068.6625794641.

Adding to 1220455101 its reverse (1015540221), we get a palindrome (2235995322).

The spelling of 1220455101 in words is "one billion, two hundred twenty million, four hundred fifty-five thousand, one hundred one".