61431616 has 14 divisors (see below), whose sum is σ = 121903490. Its totient is φ = 30715776.

The previous prime is 61431607. The next prime is 61431619. The reversal of 61431616 is 61613416.

61431616 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., 52998400 + 8433216 = 7280^2 + 2904^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61431619) 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, 479871 + ... + 479998.

Almost surely, 2^61431616 is an apocalyptic number.

It is an amenable number.

61431616 is a deficient number, since it is larger than the sum of its proper divisors (60471874).

61431616 is an equidigital number, since it uses as much as digits as its factorization.

61431616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959881 (or 959871 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 61431616 is about 7837.8323533998. The cubic root of 61431616 is about 394.5759825330.

The spelling of 61431616 in words is "sixty-one million, four hundred thirty-one thousand, six hundred sixteen".