61854779 has 4 divisors (see below), whose sum is σ = 70691184. Its totient is φ = 53018376.

The previous prime is 61854701. The next prime is 61854781. The reversal of 61854779 is 97745816.

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 61854779 - 2¹⁶ = 61789243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61854379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4418192 + ... + 4418205.

It is an arithmetic number, because the mean of its divisors is an integer number (17672796).

Almost surely, 2^61854779 is an apocalyptic number.

61854779 is a deficient number, since it is larger than the sum of its proper divisors (8836405).

61854779 is an equidigital number, since it uses as much as digits as its factorization.

61854779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8836404.

The product of its digits is 423360, while the sum is 47.

The square root of 61854779 is about 7864.7809251116. The cubic root of 61854779 is about 395.4799038079.

The spelling of 61854779 in words is "sixty-one million, eight hundred fifty-four thousand, seven hundred seventy-nine".