1554221345 has 8 divisors (see below), whose sum is σ = 1974775464. Its totient is φ = 1170237184.

The previous prime is 1554221341. The next prime is 1554221351. The reversal of 1554221345 is 5431224551.

It can be written as a sum of positive squares in 4 ways, for example, as 16875664 + 1537345681 = 4108^2 + 39209^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1554221345 - 2² = 1554221341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1554221341) 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 7 ways as a sum of consecutive naturals, for example, 9142394 + ... + 9142563.

It is an arithmetic number, because the mean of its divisors is an integer number (246846933).

Almost surely, 2^1554221345 is an apocalyptic number.

It is an amenable number.

1554221345 is a deficient number, since it is larger than the sum of its proper divisors (420554119).

1554221345 is a wasteful number, since it uses less digits than its factorization.

1554221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18284979.

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

The square root of 1554221345 is about 39423.6140530013. The cubic root of 1554221345 is about 1158.3441855800.

Adding to 1554221345 its reverse (5431224551), we get a palindrome (6985445896).

The spelling of 1554221345 in words is "one billion, five hundred fifty-four million, two hundred twenty-one thousand, three hundred forty-five".