1261061211 has 4 divisors (see below), whose sum is σ = 1681414952. Its totient is φ = 840707472.

The previous prime is 1261061189. The next prime is 1261061213. The reversal of 1261061211 is 1121601621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1261061211 - 2⁶ = 1261061147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261061213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210176866 + ... + 210176871.

It is an arithmetic number, because the mean of its divisors is an integer number (420353738).

Almost surely, 2^1261061211 is an apocalyptic number.

1261061211 is a deficient number, since it is larger than the sum of its proper divisors (420353741).

1261061211 is an equidigital number, since it uses as much as digits as its factorization.

1261061211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420353740.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1261061211 is about 35511.4236690111. The cubic root of 1261061211 is about 1080.3854394138.

Adding to 1261061211 its reverse (1121601621), we get a palindrome (2382662832).

The spelling of 1261061211 in words is "one billion, two hundred sixty-one million, sixty-one thousand, two hundred eleven".