61451779 has 4 divisors (see below), whose sum is σ = 61770376. Its totient is φ = 61133184.

The previous prime is 61451771. The next prime is 61451807. The reversal of 61451779 is 97715416.

61451779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61451779 - 2³ = 61451771 is a prime.

It is a super-2 number, since 2×61451779² = 7552642284529682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61451771) 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 3 ways as a sum of consecutive naturals, for example, 159009 + ... + 159394.

It is an arithmetic number, because the mean of its divisors is an integer number (15442594).

Almost surely, 2^61451779 is an apocalyptic number.

61451779 is a deficient number, since it is larger than the sum of its proper divisors (318597).

61451779 is a wasteful number, since it uses less digits than its factorization.

61451779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318596.

The product of its digits is 52920, while the sum is 40.

The square root of 61451779 is about 7839.1185091182. The cubic root of 61451779 is about 394.6191468719.

The spelling of 61451779 in words is "sixty-one million, four hundred fifty-one thousand, seven hundred seventy-nine".