1201543321 has 8 divisors (see below), whose sum is σ = 1314237600. Its totient is φ = 1089426240.

The previous prime is 1201543303. The next prime is 1201543349. The reversal of 1201543321 is 1233451021.

It is a happy number.

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 1201543321 - 2¹⁷ = 1201412249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201543292 and 1201543301.

It is not an unprimeable number, because it can be changed into a prime (1201546321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139936 + ... + 148273.

It is an arithmetic number, because the mean of its divisors is an integer number (164279700).

Almost surely, 2^1201543321 is an apocalyptic number.

1201543321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201543321 is a deficient number, since it is larger than the sum of its proper divisors (112694279).

1201543321 is a wasteful number, since it uses less digits than its factorization.

1201543321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288599.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1201543321 is about 34663.2849135797. The cubic root of 1201543321 is about 1063.1139360463.

Adding to 1201543321 its reverse (1233451021), we get a palindrome (2434994342).

The spelling of 1201543321 in words is "one billion, two hundred one million, five hundred forty-three thousand, three hundred twenty-one".