491506407 has 24 divisors (see below), whose sum is σ = 847042800. Its totient is φ = 280860048.

The previous prime is 491506399. The next prime is 491506417. The reversal of 491506407 is 704605194.

491506407 is a `hidden beast` number, since 4 + 9 + 1 + 5 + 0 + 640 + 7 = 666.

It is not a de Polignac number, because 491506407 - 2³ = 491506399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491506417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184432 + ... + 187077.

It is an arithmetic number, because the mean of its divisors is an integer number (35293450).

Almost surely, 2^491506407 is an apocalyptic number.

491506407 is a deficient number, since it is larger than the sum of its proper divisors (355536393).

491506407 is a wasteful number, since it uses less digits than its factorization.

491506407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371532 (or 371519 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 491506407 is about 22169.9437753008. The cubic root of 491506407 is about 789.1805887142.

The spelling of 491506407 in words is "four hundred ninety-one million, five hundred six thousand, four hundred seven".