1181290051 has 4 divisors (see below), whose sum is σ = 1232650512. Its totient is φ = 1129929592.

The previous prime is 1181290037. The next prime is 1181290087. The reversal of 1181290051 is 1500921811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1181290051 - 2⁹ = 1181289539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181290091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25680196 + ... + 25680241.

It is an arithmetic number, because the mean of its divisors is an integer number (308162628).

Almost surely, 2^1181290051 is an apocalyptic number.

1181290051 is a deficient number, since it is larger than the sum of its proper divisors (51360461).

1181290051 is an equidigital number, since it uses as much as digits as its factorization.

1181290051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51360460.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 1181290051 is about 34369.9003635448. The cubic root of 1181290051 is about 1057.1067568223.

The spelling of 1181290051 in words is "one billion, one hundred eighty-one million, two hundred ninety thousand, fifty-one".