42147609851 has 2 divisors, whose sum is σ = 42147609852. Its totient is φ = 42147609850.

The previous prime is 42147609841. The next prime is 42147609869. The reversal of 42147609851 is 15890674124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42147609851 - 2⁶ = 42147609787 is a prime.

It is a super-2 number, since 2×42147609851² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 42147609796 and 42147609805.

It is not a weakly prime, because it can be changed into another prime (42147609821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21073804925 + 21073804926.

It is an arithmetic number, because the mean of its divisors is an integer number (21073804926).

Almost surely, 2^42147609851 is an apocalyptic number.

42147609851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42147609851 is an equidigital number, since it uses as much as digits as its factorization.

42147609851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 42147609851 in words is "forty-two billion, one hundred forty-seven million, six hundred nine thousand, eight hundred fifty-one".