61284819 has 4 divisors (see below), whose sum is σ = 81713096. Its totient is φ = 40856544.

The previous prime is 61284787. The next prime is 61284829. The reversal of 61284819 is 91848216.

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

It is not a de Polignac number, because 61284819 - 2⁵ = 61284787 is a prime.

It is a super-2 number, since 2×61284819² = 7511658079725522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61284829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10214134 + ... + 10214139.

It is an arithmetic number, because the mean of its divisors is an integer number (20428274).

Almost surely, 2^61284819 is an apocalyptic number.

61284819 is a deficient number, since it is larger than the sum of its proper divisors (20428277).

61284819 is a wasteful number, since it uses less digits than its factorization.

61284819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20428276.

The product of its digits is 27648, while the sum is 39.

The square root of 61284819 is about 7828.4621095078. The cubic root of 61284819 is about 394.2614389104.

The spelling of 61284819 in words is "sixty-one million, two hundred eighty-four thousand, eight hundred nineteen".