491290625 has 48 divisors (see below), whose sum is σ = 721953792. Its totient is φ = 327240000.

The previous prime is 491290601. The next prime is 491290627. The reversal of 491290625 is 526092194.

It is not a de Polignac number, because 491290625 - 2⁶ = 491290561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491290627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 809072 + ... + 809678.

It is an arithmetic number, because the mean of its divisors is an integer number (15040704).

It is a Proth number, since it is equal to 14993 ⋅ 2¹⁵ + 1 and 14993 < 2¹⁵.

Almost surely, 2^491290625 is an apocalyptic number.

It is an amenable number.

491290625 is a deficient number, since it is larger than the sum of its proper divisors (230663167).

491290625 is an frugal number, since it uses more digits than its factorization.

491290625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 491290625 is about 22165.0766973634. The cubic root of 491290625 is about 789.0650826632.

The spelling of 491290625 in words is "four hundred ninety-one million, two hundred ninety thousand, six hundred twenty-five".