491802145 has 8 divisors (see below), whose sum is σ = 590281704. Its totient is φ = 393362304.

The previous prime is 491802131. The next prime is 491802167. The reversal of 491802145 is 541208194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 692224 + 491109921 = 832^2 + 22161^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 491802145 - 2¹¹ = 491800097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491802145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42307 + ... + 52663.

It is an arithmetic number, because the mean of its divisors is an integer number (73785213).

Almost surely, 2^491802145 is an apocalyptic number.

It is an amenable number.

491802145 is a deficient number, since it is larger than the sum of its proper divisors (98479559).

491802145 is a wasteful number, since it uses less digits than its factorization.

491802145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19859.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 491802145 is about 22176.6125681990. The cubic root of 491802145 is about 789.3388395468.

The spelling of 491802145 in words is "four hundred ninety-one million, eight hundred two thousand, one hundred forty-five".