42642751 has 4 divisors (see below), whose sum is σ = 42656112. Its totient is φ = 42629392.

The previous prime is 42642739. The next prime is 42642767. The reversal of 42642751 is 15724624.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42642751 - 2⁷ = 42642623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42645751) 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, 1230 + ... + 9316.

It is an arithmetic number, because the mean of its divisors is an integer number (10664028).

Almost surely, 2^42642751 is an apocalyptic number.

42642751 is a deficient number, since it is larger than the sum of its proper divisors (13361).

42642751 is an equidigital number, since it uses as much as digits as its factorization.

42642751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13360.

The product of its digits is 13440, while the sum is 31.

The square root of 42642751 is about 6530.1417289367. The cubic root of 42642751 is about 349.3668853822.

The spelling of 42642751 in words is "forty-two million, six hundred forty-two thousand, seven hundred fifty-one".