1139195121 has 4 divisors (see below), whose sum is σ = 1518926832. Its totient is φ = 759463412.

The previous prime is 1139195117. The next prime is 1139195147. The reversal of 1139195121 is 1215919311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1139195121 - 2² = 1139195117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1139195921) 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, 189865851 + ... + 189865856.

It is an arithmetic number, because the mean of its divisors is an integer number (379731708).

Almost surely, 2^1139195121 is an apocalyptic number.

It is an amenable number.

1139195121 is a deficient number, since it is larger than the sum of its proper divisors (379731711).

1139195121 is an equidigital number, since it uses as much as digits as its factorization.

1139195121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379731710.

The product of its digits is 2430, while the sum is 33.

The square root of 1139195121 is about 33751.9646983698. The cubic root of 1139195121 is about 1044.3980174897.

The spelling of 1139195121 in words is "one billion, one hundred thirty-nine million, one hundred ninety-five thousand, one hundred twenty-one".