491420225 has 24 divisors (see below), whose sum is σ = 632068920. Its totient is φ = 378560000.

The previous prime is 491420213. The next prime is 491420257. The reversal of 491420225 is 522024194.

491420225 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 22168²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 350475841 + 140944384 = 18721^2 + 11872^2 .

It is not a de Polignac number, because 491420225 - 2¹⁴ = 491403841 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377075 + ... + 378375.

It is an arithmetic number, because the mean of its divisors is an integer number (26336205).

Almost surely, 2^491420225 is an apocalyptic number.

It is an amenable number.

491420225 is a deficient number, since it is larger than the sum of its proper divisors (140648695).

491420225 is a wasteful number, since it uses less digits than its factorization.

491420225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 491420225 is about 22168.0000225550. Note that the first 4 decimals coincide. The cubic root of 491420225 is about 789.1344603653.

The spelling of 491420225 in words is "four hundred ninety-one million, four hundred twenty thousand, two hundred twenty-five".