61421643 has 12 divisors (see below), whose sum is σ = 88896600. Its totient is φ = 40866336.

The previous prime is 61421641. The next prime is 61421653. The reversal of 61421643 is 34612416.

61421643 is a `hidden beast` number, since 6 + 14 + 2 + 1 + 643 = 666.

61421643 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 61421643 - 2¹ = 61421641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61421641) 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 11 ways as a sum of consecutive naturals, for example, 1818 + ... + 11231.

It is an arithmetic number, because the mean of its divisors is an integer number (7408050).

Almost surely, 2^61421643 is an apocalyptic number.

61421643 is a deficient number, since it is larger than the sum of its proper divisors (27474957).

61421643 is a wasteful number, since it uses less digits than its factorization.

61421643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13578 (or 13575 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 61421643 is about 7837.1961185108. The cubic root of 61421643 is about 394.5546291458.

The spelling of 61421643 in words is "sixty-one million, four hundred twenty-one thousand, six hundred forty-three".