42319871987 has 2 divisors, whose sum is σ = 42319871988. Its totient is φ = 42319871986.

The previous prime is 42319871983. The next prime is 42319872031. The reversal of 42319871987 is 78917891324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42319871987 - 2² = 42319871983 is a prime.

It is not a weakly prime, because it can be changed into another prime (42319871983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21159935993 + 21159935994.

It is an arithmetic number, because the mean of its divisors is an integer number (21159935994).

Almost surely, 2^42319871987 is an apocalyptic number.

42319871987 is a deficient number, since it is larger than the sum of its proper divisors (1).

42319871987 is an equidigital number, since it uses as much as digits as its factorization.

42319871987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 59.

The spelling of 42319871987 in words is "forty-two billion, three hundred nineteen million, eight hundred seventy-one thousand, nine hundred eighty-seven".