1221054546 has 32 divisors (see below), whose sum is σ = 2614835520. Its totient is φ = 378768896.

The previous prime is 1221054539. The next prime is 1221054557. The reversal of 1221054546 is 6454501221.

It is a super-2 number, since 2×1221054546² = 2981948408614532232, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 58176 + ... + 76331.

It is an arithmetic number, because the mean of its divisors is an integer number (81713610).

Almost surely, 2^1221054546 is an apocalyptic number.

1221054546 is an abundant number, since it is smaller than the sum of its proper divisors (1393780974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221054546 is a wasteful number, since it uses less digits than its factorization.

1221054546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134618.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1221054546 is about 34943.5909145010. The cubic root of 1221054546 is about 1068.8375140950.

Adding to 1221054546 its reverse (6454501221), we get a palindrome (7675555767).

The spelling of 1221054546 in words is "one billion, two hundred twenty-one million, fifty-four thousand, five hundred forty-six".