491442151 has 4 divisors (see below), whose sum is σ = 491492232. Its totient is φ = 491392072.

The previous prime is 491442143. The next prime is 491442157. The reversal of 491442151 is 151244194.

491442151 = T₁₈₀₉₉ + T₁₈₁₀₀ + T₁₈₁₀₁.

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, and also an emirpimes, since its reverse is a distinct semiprime: 151244194 = 2 ⋅75622097.

It is a cyclic number.

It is not a de Polignac number, because 491442151 - 2³ = 491442143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491442157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4945 + ... + 31738.

It is an arithmetic number, because the mean of its divisors is an integer number (122873058).

Almost surely, 2^491442151 is an apocalyptic number.

491442151 is the 18101-st centered triangular number.

491442151 is a deficient number, since it is larger than the sum of its proper divisors (50081).

491442151 is a wasteful number, since it uses less digits than its factorization.

491442151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50080.

The product of its digits is 5760, while the sum is 31.

The square root of 491442151 is about 22168.4945587200. The cubic root of 491442151 is about 789.1461966241.

The spelling of 491442151 in words is "four hundred ninety-one million, four hundred forty-two thousand, one hundred fifty-one".