1220555451 has 32 divisors (see below), whose sum is σ = 1713945600. Its totient is φ = 771563520.

The previous prime is 1220555449. The next prime is 1220555503. The reversal of 1220555451 is 1545550221.

It is not a de Polignac number, because 1220555451 - 2¹ = 1220555449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220555431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1766016 + ... + 1766706.

It is an arithmetic number, because the mean of its divisors is an integer number (53560800).

Almost surely, 2^1220555451 is an apocalyptic number.

1220555451 is a deficient number, since it is larger than the sum of its proper divisors (493390149).

1220555451 is a wasteful number, since it uses less digits than its factorization.

1220555451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1220555451 is about 34936.4487462593. The cubic root of 1220555451 is about 1068.6918683610.

The spelling of 1220555451 in words is "one billion, two hundred twenty million, five hundred fifty-five thousand, four hundred fifty-one".