61531012 has 6 divisors (see below), whose sum is σ = 107679278. Its totient is φ = 30765504.

The previous prime is 61530961. The next prime is 61531013. The reversal of 61531012 is 21013516.

61531012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 56761156 + 4769856 = 7534^2 + 2184^2 .

It is not an unprimeable number, because it can be changed into a prime (61531013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7691373 + ... + 7691380.

Almost surely, 2^61531012 is an apocalyptic number.

It is an amenable number.

61531012 is a deficient number, since it is larger than the sum of its proper divisors (46148266).

61531012 is a wasteful number, since it uses less digits than its factorization.

61531012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15382757 (or 15382755 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 61531012 is about 7844.1705743820. The cubic root of 61531012 is about 394.7886750829.

Adding to 61531012 its reverse (21013516), we get a palindrome (82544528).

The spelling of 61531012 in words is "sixty-one million, five hundred thirty-one thousand, twelve".