654532531 has 4 divisors (see below), whose sum is σ = 658548232. Its totient is φ = 650516832.

The previous prime is 654532519. The next prime is 654532537. The reversal of 654532531 is 135235456.

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 654532531 - 2¹⁵ = 654499763 is a prime.

It is a super-2 number, since 2×654532531² = 856825668274531922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654532537) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2007606 + ... + 2007931.

It is an arithmetic number, because the mean of its divisors is an integer number (164637058).

Almost surely, 2^654532531 is an apocalyptic number.

654532531 is a deficient number, since it is larger than the sum of its proper divisors (4015701).

654532531 is a wasteful number, since it uses less digits than its factorization.

654532531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015700.

The product of its digits is 54000, while the sum is 34.

The square root of 654532531 is about 25583.8333914212. The cubic root of 654532531 is about 868.2479077507.

Adding to 654532531 its reverse (135235456), we get a palindrome (789767987).

The spelling of 654532531 in words is "six hundred fifty-four million, five hundred thirty-two thousand, five hundred thirty-one".