1220454557 has 16 divisors (see below), whose sum is σ = 1407998592. Its totient is φ = 1036239360.

The previous prime is 1220454551. The next prime is 1220454559. The reversal of 1220454557 is 7554540221.

1220454557 = T₁₀₈ + T₁₀₉ + ... + T₁₉₄₁.

It is a cyclic number.

It is not a de Polignac number, because 1220454557 - 2¹⁴ = 1220438173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220454551) 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, 785093 + ... + 786645.

It is an arithmetic number, because the mean of its divisors is an integer number (87999912).

Almost surely, 2^1220454557 is an apocalyptic number.

It is an amenable number.

1220454557 is a deficient number, since it is larger than the sum of its proper divisors (187544035).

1220454557 is a wasteful number, since it uses less digits than its factorization.

1220454557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548.

The product of its (nonzero) digits is 56000, while the sum is 35.

The square root of 1220454557 is about 34935.0047516814. The cubic root of 1220454557 is about 1068.6624206839.

Adding to 1220454557 its reverse (7554540221), we get a palindrome (8774994778).

The spelling of 1220454557 in words is "one billion, two hundred twenty million, four hundred fifty-four thousand, five hundred fifty-seven".