42155719 has 2 divisors, whose sum is σ = 42155720. Its totient is φ = 42155718.

The previous prime is 42155713. The next prime is 42155741. The reversal of 42155719 is 91755124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42155719 is a prime.

It is a super-2 number, since 2×42155719² = 3554209288813922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42155713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077859 + 21077860.

It is an arithmetic number, because the mean of its divisors is an integer number (21077860).

Almost surely, 2^42155719 is an apocalyptic number.

42155719 is a deficient number, since it is larger than the sum of its proper divisors (1).

42155719 is an equidigital number, since it uses as much as digits as its factorization.

42155719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 42155719 is about 6492.7435649346. The cubic root of 42155719 is about 348.0317246588.

The spelling of 42155719 in words is "forty-two million, one hundred fifty-five thousand, seven hundred nineteen".