42651813 has 4 divisors (see below), whose sum is σ = 56869088. Its totient is φ = 28434540.

The previous prime is 42651811. The next prime is 42651823. The reversal of 42651813 is 31815624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42651813 - 2¹ = 42651811 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 (42651811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7108633 + ... + 7108638.

It is an arithmetic number, because the mean of its divisors is an integer number (14217272).

Almost surely, 2^42651813 is an apocalyptic number.

It is an amenable number.

42651813 is a deficient number, since it is larger than the sum of its proper divisors (14217275).

42651813 is a wasteful number, since it uses less digits than its factorization.

42651813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14217274.

The product of its digits is 5760, while the sum is 30.

The square root of 42651813 is about 6530.8355514436. The cubic root of 42651813 is about 349.3916315848.

The spelling of 42651813 in words is "forty-two million, six hundred fifty-one thousand, eight hundred thirteen".