1221534554 has 8 divisors (see below), whose sum is σ = 1911967200. Its totient is φ = 584212156.

The previous prime is 1221534547. The next prime is 1221534557. The reversal of 1221534554 is 4554351221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221534554.

It is not an unprimeable number, because it can be changed into a prime (1221534557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13277504 + ... + 13277595.

It is an arithmetic number, because the mean of its divisors is an integer number (238995900).

Almost surely, 2^1221534554 is an apocalyptic number.

1221534554 is a deficient number, since it is larger than the sum of its proper divisors (690432646).

1221534554 is a wasteful number, since it uses less digits than its factorization.

1221534554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26555124.

The product of its digits is 24000, while the sum is 32.

The square root of 1221534554 is about 34950.4585663765. The cubic root of 1221534554 is about 1068.9775524319.

Adding to 1221534554 its reverse (4554351221), we get a palindrome (5775885775).

The spelling of 1221534554 in words is "one billion, two hundred twenty-one million, five hundred thirty-four thousand, five hundred fifty-four".