1200533261 has 4 divisors (see below), whose sum is σ = 1204775712. Its totient is φ = 1196290812.

The previous prime is 1200533233. The next prime is 1200533273. The reversal of 1200533261 is 1623350021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1623350021 = 443 ⋅3664447.

It is a cyclic number.

It is not a de Polignac number, because 1200533261 - 2⁶ = 1200533197 is a prime.

It is a super-2 number, since 2×1200533261² = 2882560221534588242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200539261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120801 + ... + 2121366.

It is an arithmetic number, because the mean of its divisors is an integer number (301193928).

Almost surely, 2^1200533261 is an apocalyptic number.

It is an amenable number.

1200533261 is a deficient number, since it is larger than the sum of its proper divisors (4242451).

1200533261 is an equidigital number, since it uses as much as digits as its factorization.

1200533261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242450.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1200533261 is about 34648.7122560132. The cubic root of 1200533261 is about 1062.8159554192.

Adding to 1200533261 its reverse (1623350021), we get a palindrome (2823883282).

The spelling of 1200533261 in words is "one billion, two hundred million, five hundred thirty-three thousand, two hundred sixty-one".