1220011261 has 12 divisors (see below), whose sum is σ = 1493892480. Its totient is φ = 990685080.

The previous prime is 1220011193. The next prime is 1220011267. The reversal of 1220011261 is 1621100221.

It is not a de Polignac number, because 1220011261 - 2¹¹ = 1220009213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011267) 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 11 ways as a sum of consecutive naturals, for example, 654285 + ... + 656146.

It is an arithmetic number, because the mean of its divisors is an integer number (124491040).

Almost surely, 2^1220011261 is an apocalyptic number.

It is an amenable number.

1220011261 is a deficient number, since it is larger than the sum of its proper divisors (273881219).

1220011261 is a wasteful number, since it uses less digits than its factorization.

1220011261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310464 (or 1310457 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1220011261 is about 34928.6595935200. The cubic root of 1220011261 is about 1068.5330177653.

Adding to 1220011261 its reverse (1621100221), we get a palindrome (2841111482).

The spelling of 1220011261 in words is "one billion, two hundred twenty million, eleven thousand, two hundred sixty-one".