581642231 has 4 divisors (see below), whose sum is σ = 612255000. Its totient is φ = 551029464.

The previous prime is 581642221. The next prime is 581642251. The reversal of 581642231 is 132246185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132246185 = 5 ⋅26449237.

It is a cyclic number.

It is not a de Polignac number, because 581642231 - 2²⁶ = 514533367 is a prime.

It is a super-2 number, since 2×581642231² = 676615369765314722, 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 (581642221) 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, 15306356 + ... + 15306393.

It is an arithmetic number, because the mean of its divisors is an integer number (153063750).

Almost surely, 2^581642231 is an apocalyptic number.

581642231 is a deficient number, since it is larger than the sum of its proper divisors (30612769).

581642231 is a wasteful number, since it uses less digits than its factorization.

581642231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30612768.

The product of its digits is 11520, while the sum is 32.

The square root of 581642231 is about 24117.2600226477. The cubic root of 581642231 is about 834.7414457587.

The spelling of 581642231 in words is "five hundred eighty-one million, six hundred forty-two thousand, two hundred thirty-one".