491531455 has 16 divisors (see below), whose sum is σ = 625440960. Its totient is φ = 369556992.

The previous prime is 491531437. The next prime is 491531479. The reversal of 491531455 is 554135194.

It is a cyclic number.

It is not a de Polignac number, because 491531455 - 2⁵ = 491531423 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60526 + ... + 68164.

It is an arithmetic number, because the mean of its divisors is an integer number (39090060).

Almost surely, 2^491531455 is an apocalyptic number.

491531455 is a deficient number, since it is larger than the sum of its proper divisors (133909505).

491531455 is a wasteful number, since it uses less digits than its factorization.

491531455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418.

The product of its digits is 54000, while the sum is 37.

The square root of 491531455 is about 22170.5086770692. The cubic root of 491531455 is about 789.1939944802.

The spelling of 491531455 in words is "four hundred ninety-one million, five hundred thirty-one thousand, four hundred fifty-five".