61819018 has 4 divisors (see below), whose sum is σ = 92728530. Its totient is φ = 30909508.

The previous prime is 61819007. The next prime is 61819049. The reversal of 61819018 is 81091816.

61819018 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 can be written as a sum of positive squares in only one way, i.e., 60419529 + 1399489 = 7773^2 + 1183^2 .

It is an unprimeable number.

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, 15454753 + ... + 15454756.

Almost surely, 2^61819018 is an apocalyptic number.

61819018 is a deficient number, since it is larger than the sum of its proper divisors (30909512).

61819018 is a wasteful number, since it uses less digits than its factorization.

61819018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30909511.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 61819018 is about 7862.5071065151. The cubic root of 61819018 is about 395.4036742723.

The spelling of 61819018 in words is "sixty-one million, eight hundred nineteen thousand, eighteen".