1201909121 has 8 divisors (see below), whose sum is σ = 1379771904. Its totient is φ = 1025586720.

The previous prime is 1201909117. The next prime is 1201909123. The reversal of 1201909121 is 1219091021.

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 1201909121 - 2² = 1201909117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201909123) 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, 383420 + ... + 386541.

It is an arithmetic number, because the mean of its divisors is an integer number (172471488).

Almost surely, 2^1201909121 is an apocalyptic number.

It is an amenable number.

1201909121 is a deficient number, since it is larger than the sum of its proper divisors (177862783).

1201909121 is an equidigital number, since it uses as much as digits as its factorization.

1201909121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770191.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1201909121 is about 34668.5609883075. The cubic root of 1201909121 is about 1063.2218105366.

The spelling of 1201909121 in words is "one billion, two hundred one million, nine hundred nine thousand, one hundred twenty-one".