493991531 has 4 divisors (see below), whose sum is σ = 538899864. Its totient is φ = 449083200.

The previous prime is 493991527. The next prime is 493991543. The reversal of 493991531 is 135199394.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 493991531 - 2² = 493991527 is a prime.

It is a super-2 number, since 2×493991531² = 488055265399447922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (493991521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22454150 + ... + 22454171.

It is an arithmetic number, because the mean of its divisors is an integer number (134724966).

Almost surely, 2^493991531 is an apocalyptic number.

493991531 is a deficient number, since it is larger than the sum of its proper divisors (44908333).

493991531 is a wasteful number, since it uses less digits than its factorization.

493991531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44908332.

The product of its digits is 131220, while the sum is 44.

The square root of 493991531 is about 22225.9202509142. The cubic root of 493991531 is about 790.5084218558.

The spelling of 493991531 in words is "four hundred ninety-three million, nine hundred ninety-one thousand, five hundred thirty-one".