61383987 has 56 divisors (see below), whose sum is σ = 109964544. Its totient is φ = 33487344.

The previous prime is 61383979. The next prime is 61383989. The reversal of 61383987 is 78938316.

It is a happy number.

61383987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61383987 - 2³ = 61383979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61383989) 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 in 55 ways as a sum of consecutive naturals, for example, 117108 + ... + 117630.

Almost surely, 2^61383987 is an apocalyptic number.

61383987 is a deficient number, since it is larger than the sum of its proper divisors (48580557).

61383987 is an equidigital number, since it uses as much as digits as its factorization.

61383987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 556 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 61383987 is about 7834.7933603893. The cubic root of 61383987 is about 394.4739822943.

The spelling of 61383987 in words is "sixty-one million, three hundred eighty-three thousand, nine hundred eighty-seven".