1201031291 has 4 divisors (see below), whose sum is σ = 1201105752. Its totient is φ = 1200956832.

The previous prime is 1201031231. The next prime is 1201031297. The reversal of 1201031291 is 1921301021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1201031291 - 2¹⁰ = 1201030267 is a prime.

It is a super-2 number, since 2×1201031291² = 2884952323922253362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201031297) 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, 1790 + ... + 49043.

It is an arithmetic number, because the mean of its divisors is an integer number (300276438).

Almost surely, 2^1201031291 is an apocalyptic number.

1201031291 is a deficient number, since it is larger than the sum of its proper divisors (74461).

1201031291 is an equidigital number, since it uses as much as digits as its factorization.

1201031291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74460.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1201031291 is about 34655.8983579996. The cubic root of 1201031291 is about 1062.9629015224.

The spelling of 1201031291 in words is "one billion, two hundred one million, thirty-one thousand, two hundred ninety-one".