42775551 has 48 divisors (see below), whose sum is σ = 78711360. Its totient is φ = 21772800.

The previous prime is 42775543. The next prime is 42775613. The reversal of 42775551 is 15557724.

It is not a de Polignac number, because 42775551 - 2³ = 42775543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42775541) 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 47 ways as a sum of consecutive naturals, for example, 22851 + ... + 24651.

It is an arithmetic number, because the mean of its divisors is an integer number (1639820).

Almost surely, 2^42775551 is an apocalyptic number.

42775551 is a deficient number, since it is larger than the sum of its proper divisors (35935809).

42775551 is a wasteful number, since it uses less digits than its factorization.

42775551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856 (or 1853 counting only the distinct ones).

The product of its digits is 49000, while the sum is 36.

The square root of 42775551 is about 6540.3020572448. The cubic root of 42775551 is about 349.7291809790.

The spelling of 42775551 in words is "forty-two million, seven hundred seventy-five thousand, five hundred fifty-one".