42779951 has 4 divisors (see below), whose sum is σ = 42892032. Its totient is φ = 42667872.

The previous prime is 42779941. The next prime is 42780013. The reversal of 42779951 is 15997724.

42779951 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 42779951 - 2¹⁸ = 42517807 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42779911) 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, 55466 + ... + 56231.

It is an arithmetic number, because the mean of its divisors is an integer number (10723008).

Almost surely, 2^42779951 is an apocalyptic number.

42779951 is a deficient number, since it is larger than the sum of its proper divisors (112081).

42779951 is a wasteful number, since it uses less digits than its factorization.

42779951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112080.

The product of its digits is 158760, while the sum is 44.

The square root of 42779951 is about 6540.6384244965. The cubic root of 42779951 is about 349.7411719068.

The spelling of 42779951 in words is "forty-two million, seven hundred seventy-nine thousand, nine hundred fifty-one".