1201122261 has 24 divisors (see below), whose sum is σ = 1872823680. Its totient is φ = 739517856.

The previous prime is 1201122211. The next prime is 1201122277. The reversal of 1201122261 is 1622211021.

It is not a de Polignac number, because 1201122261 - 2¹³ = 1201114069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94041 + ... + 106046.

It is an arithmetic number, because the mean of its divisors is an integer number (78034320).

Almost surely, 2^1201122261 is an apocalyptic number.

It is an amenable number.

1201122261 is a deficient number, since it is larger than the sum of its proper divisors (671701419).

1201122261 is a wasteful number, since it uses less digits than its factorization.

1201122261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200145 (or 200142 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1201122261 is about 34657.2108081421. The cubic root of 1201122261 is about 1062.9897382625.

Adding to 1201122261 its reverse (1622211021), we get a palindrome (2823333282).

The spelling of 1201122261 in words is "one billion, two hundred one million, one hundred twenty-two thousand, two hundred sixty-one".