1201211091 has 6 divisors (see below), whose sum is σ = 1735082700. Its totient is φ = 800807388.

The previous prime is 1201211069. The next prime is 1201211107. The reversal of 1201211091 is 1901121021.

It is a happy number.

It is not a de Polignac number, because 1201211091 - 2¹⁴ = 1201194707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201211021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66733941 + ... + 66733958.

It is an arithmetic number, because the mean of its divisors is an integer number (289180450).

Almost surely, 2^1201211091 is an apocalyptic number.

1201211091 is a deficient number, since it is larger than the sum of its proper divisors (533871609).

1201211091 is a wasteful number, since it uses less digits than its factorization.

1201211091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133467905 (or 133467902 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 1201211091 is about 34658.4923359341. The cubic root of 1201211091 is about 1063.0159423812.

The spelling of 1201211091 in words is "one billion, two hundred one million, two hundred eleven thousand, ninety-one".