516561231 has 4 divisors (see below), whose sum is σ = 688748312. Its totient is φ = 344374152.

The previous prime is 516561191. The next prime is 516561239. The reversal of 516561231 is 132165615.

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

It is not a de Polignac number, because 516561231 - 2¹³ = 516553039 is a prime.

It is a super-2 number, since 2×516561231² = 533671010744470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516561239) 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, 86093536 + ... + 86093541.

It is an arithmetic number, because the mean of its divisors is an integer number (172187078).

Almost surely, 2^516561231 is an apocalyptic number.

516561231 is a deficient number, since it is larger than the sum of its proper divisors (172187081).

516561231 is a wasteful number, since it uses less digits than its factorization.

516561231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172187080.

The product of its digits is 5400, while the sum is 30.

The square root of 516561231 is about 22727.9834345241. The cubic root of 516561231 is about 802.3686212662.

It can be divided in two parts, 51656 and 1231, that multiplied together give a palindrome (63588536).

The spelling of 516561231 in words is "five hundred sixteen million, five hundred sixty-one thousand, two hundred thirty-one".