1121230291 has 4 divisors (see below), whose sum is σ = 1187185032. Its totient is φ = 1055275552.

The previous prime is 1121230273. The next prime is 1121230339. The reversal of 1121230291 is 1920321211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1920321211 = 1093 ⋅1756927.

It is a cyclic number.

It is not a de Polignac number, because 1121230291 - 2⁷ = 1121230163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121230241) 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, 32977345 + ... + 32977378.

It is an arithmetic number, because the mean of its divisors is an integer number (296796258).

Almost surely, 2^1121230291 is an apocalyptic number.

1121230291 is a deficient number, since it is larger than the sum of its proper divisors (65954741).

1121230291 is an equidigital number, since it uses as much as digits as its factorization.

1121230291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65954740.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1121230291 is about 33484.7770038864. Note that the first 3 decimals coincide. The cubic root of 1121230291 is about 1038.8789359100.

The spelling of 1121230291 in words is "one billion, one hundred twenty-one million, two hundred thirty thousand, two hundred ninety-one".