491693477 has 8 divisors (see below), whose sum is σ = 536699520. Its totient is φ = 446738560.

The previous prime is 491693467. The next prime is 491693479. The reversal of 491693477 is 774396194.

It is a happy number.

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 491693477 - 2⁶ = 491693413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491693479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8948 + ... + 32610.

It is an arithmetic number, because the mean of its divisors is an integer number (67087440).

Almost surely, 2^491693477 is an apocalyptic number.

It is an amenable number.

491693477 is a deficient number, since it is larger than the sum of its proper divisors (45006043).

491693477 is a wasteful number, since it uses less digits than its factorization.

491693477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25563.

The product of its digits is 1143072, while the sum is 50.

The square root of 491693477 is about 22174.1623742589. The cubic root of 491693477 is about 789.2806981497.

The spelling of 491693477 in words is "four hundred ninety-one million, six hundred ninety-three thousand, four hundred seventy-seven".