61443231 has 4 divisors (see below), whose sum is σ = 81924312. Its totient is φ = 40962152.

The previous prime is 61443211. The next prime is 61443233. The reversal of 61443231 is 13234416.

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 61443231 - 2⁷ = 61443103 is a prime.

It is a super-2 number, since 2×61443231² = 7550541271438722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61443233) 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, 10240536 + ... + 10240541.

It is an arithmetic number, because the mean of its divisors is an integer number (20481078).

Almost surely, 2^61443231 is an apocalyptic number.

61443231 is a deficient number, since it is larger than the sum of its proper divisors (20481081).

61443231 is a wasteful number, since it uses less digits than its factorization.

61443231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20481080.

The product of its digits is 1728, while the sum is 24.

The square root of 61443231 is about 7838.5732757945. The cubic root of 61443231 is about 394.6008487258.

Adding to 61443231 its reverse (13234416), we get a palindrome (74677647).

The spelling of 61443231 in words is "sixty-one million, four hundred forty-three thousand, two hundred thirty-one".