61911819 has 12 divisors (see below), whose sum is σ = 90763816. Its totient is φ = 40658112.

The previous prime is 61911809. The next prime is 61911833. The reversal of 61911819 is 91811916.

61911819 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 61911819 - 2⁷ = 61911691 is a prime.

It is a super-2 number, since 2×61911819² = 7666146663777522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61911809) 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, 50734 + ... + 51939.

Almost surely, 2^61911819 is an apocalyptic number.

61911819 is a deficient number, since it is larger than the sum of its proper divisors (28851997).

61911819 is a wasteful number, since it uses less digits than its factorization.

61911819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102746 (or 102743 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 61911819 is about 7868.4063824894. The cubic root of 61911819 is about 395.6014317025.

The spelling of 61911819 in words is "sixty-one million, nine hundred eleven thousand, eight hundred nineteen".