42154681 has 2 divisors, whose sum is σ = 42154682. Its totient is φ = 42154680.

The previous prime is 42154667. The next prime is 42154687. The reversal of 42154681 is 18645124.

42154681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34999056 + 7155625 = 5916^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 42154681 - 2⁵ = 42154649 is a prime.

It is a super-2 number, since 2×42154681² = 3554034260423522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42154687) 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 as a sum of consecutive naturals, namely, 21077340 + 21077341.

It is an arithmetic number, because the mean of its divisors is an integer number (21077341).

Almost surely, 2^42154681 is an apocalyptic number.

It is an amenable number.

42154681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42154681 is an equidigital number, since it uses as much as digits as its factorization.

42154681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 42154681 is about 6492.6636290509. The cubic root of 42154681 is about 348.0288681077.

The spelling of 42154681 in words is "forty-two million, one hundred fifty-four thousand, six hundred eighty-one".