61731243 has 24 divisors (see below), whose sum is σ = 102453728. Its totient is φ = 35085312.

The previous prime is 61731223. The next prime is 61731251. The reversal of 61731243 is 34213716.

61731243 is a `hidden beast` number, since 617 + 3 + 1 + 2 + 43 = 666.

It is not a de Polignac number, because 61731243 - 2⁵ = 61731211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61731223) 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 23 ways as a sum of consecutive naturals, for example, 9621 + ... + 14697.

Almost surely, 2^61731243 is an apocalyptic number.

61731243 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

61731243 is a deficient number, since it is larger than the sum of its proper divisors (40722485).

61731243 is a wasteful number, since it uses less digits than its factorization.

61731243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5283 (or 5280 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 61731243 is about 7856.9232527752. The cubic root of 61731243 is about 395.2164449596.

Adding to 61731243 its reverse (34213716), we get a palindrome (95944959).

The spelling of 61731243 in words is "sixty-one million, seven hundred thirty-one thousand, two hundred forty-three".