61443531 has 12 divisors (see below), whose sum is σ = 90207520. Its totient is φ = 40290480.

The previous prime is 61443509. The next prime is 61443539. The reversal of 61443531 is 13534416.

61443531 is a `hidden beast` number, since 614 + 43 + 5 + 3 + 1 = 666.

It is not a de Polignac number, because 61443531 - 2⁶ = 61443467 is a prime.

It is a super-2 number, since 2×61443531² = 7550615003495922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61443495 and 61443504.

It is not an unprimeable number, because it can be changed into a prime (61443539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55411 + ... + 56508.

Almost surely, 2^61443531 is an apocalyptic number.

61443531 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61443531 is a deficient number, since it is larger than the sum of its proper divisors (28763989).

61443531 is a wasteful number, since it uses less digits than its factorization.

61443531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111986 (or 111983 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 61443531 is about 7838.5924119066. The cubic root of 61443531 is about 394.6014909450.

Adding to 61443531 its reverse (13534416), we get a palindrome (74977947).

The spelling of 61443531 in words is "sixty-one million, four hundred forty-three thousand, five hundred thirty-one".