1220617455 has 16 divisors (see below), whose sum is σ = 1955457504. Its totient is φ = 650172800.

The previous prime is 1220617439. The next prime is 1220617469. The reversal of 1220617455 is 5547160221.

It is not a de Polignac number, because 1220617455 - 2⁴ = 1220617439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39096 + ... + 63005.

It is an arithmetic number, because the mean of its divisors is an integer number (122216094).

Almost surely, 2^1220617455 is an apocalyptic number.

1220617455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220617455 is a deficient number, since it is larger than the sum of its proper divisors (734840049).

1220617455 is a wasteful number, since it uses less digits than its factorization.

1220617455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102906.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1220617455 is about 34937.3361176836. The cubic root of 1220617455 is about 1068.7099645069.

Adding to 1220617455 its reverse (5547160221), we get a palindrome (6767777676).

The spelling of 1220617455 in words is "one billion, two hundred twenty million, six hundred seventeen thousand, four hundred fifty-five".