1201212091 has 8 divisors (see below), whose sum is σ = 1266413120. Its totient is φ = 1136209032.

The previous prime is 1201212083. The next prime is 1201212109. The reversal of 1201212091 is 1902121021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201212091 - 2³ = 1201212083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201212071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36945 + ... + 61378.

It is an arithmetic number, because the mean of its divisors is an integer number (158301640).

Almost surely, 2^1201212091 is an apocalyptic number.

1201212091 is a deficient number, since it is larger than the sum of its proper divisors (65201029).

1201212091 is an equidigital number, since it uses as much as digits as its factorization.

1201212091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98985.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1201212091 is about 34658.5067624097. The cubic root of 1201212091 is about 1063.0162373656.

The spelling of 1201212091 in words is "one billion, two hundred one million, two hundred twelve thousand, ninety-one".