491149121 has 8 divisors (see below), whose sum is σ = 496717704. Its totient is φ = 485591040.

The previous prime is 491149073. The next prime is 491149123. The reversal of 491149121 is 121941194.

It can be written as a sum of positive squares in 4 ways, for example, as 101284096 + 389865025 = 10064^2 + 19745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491149121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491149123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126221 + ... + 130053.

It is an arithmetic number, because the mean of its divisors is an integer number (62089713).

Almost surely, 2^491149121 is an apocalyptic number.

It is an amenable number.

491149121 is a deficient number, since it is larger than the sum of its proper divisors (5568583).

491149121 is a wasteful number, since it uses less digits than its factorization.

491149121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251.

The product of its digits is 2592, while the sum is 32.

The square root of 491149121 is about 22161.8844189748. The cubic root of 491149121 is about 788.9893185558.

The spelling of 491149121 in words is "four hundred ninety-one million, one hundred forty-nine thousand, one hundred twenty-one".