1220452155 has 24 divisors (see below), whose sum is σ = 2278178448. Its totient is φ = 600837696.

The previous prime is 1220452139. The next prime is 1220452159. The reversal of 1220452155 is 5512540221.

It is not a de Polignac number, because 1220452155 - 2⁴ = 1220452139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220452159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1042537 + ... + 1043706.

It is an arithmetic number, because the mean of its divisors is an integer number (94924102).

Almost surely, 2^1220452155 is an apocalyptic number.

1220452155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220452155 is a deficient number, since it is larger than the sum of its proper divisors (1057726293).

1220452155 is a wasteful number, since it uses less digits than its factorization.

1220452155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086267 (or 2086264 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1220452155 is about 34934.9703735383. The cubic root of 1220452155 is about 1068.6617195984.

Adding to 1220452155 its reverse (5512540221), we get a palindrome (6732992376).

The spelling of 1220452155 in words is "one billion, two hundred twenty million, four hundred fifty-two thousand, one hundred fifty-five".