42678761 has 2 divisors, whose sum is σ = 42678762. Its totient is φ = 42678760.

The previous prime is 42678751. The next prime is 42678763. The reversal of 42678761 is 16787624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31416025 + 11262736 = 5605^2 + 3356^2 .

It is a cyclic number.

It is not a de Polignac number, because 42678761 - 2⁶ = 42678697 is a prime.

Together with 42678763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42678763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21339380 + 21339381.

It is an arithmetic number, because the mean of its divisors is an integer number (21339381).

Almost surely, 2^42678761 is an apocalyptic number.

It is an amenable number.

42678761 is a deficient number, since it is larger than the sum of its proper divisors (1).

42678761 is an equidigital number, since it uses as much as digits as its factorization.

42678761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 42678761 is about 6532.8983613707. The cubic root of 42678761 is about 349.4651995670.

The spelling of 42678761 in words is "forty-two million, six hundred seventy-eight thousand, seven hundred sixty-one".