19156139 has 2 divisors, whose sum is σ = 19156140. Its totient is φ = 19156138.

The previous prime is 19156133. The next prime is 19156141. The reversal of 19156139 is 93165191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19156139 is a prime.

It is a super-2 number, since 2×19156139² = 733915322774642, which contains 22 as substring.

Together with 19156141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19156099 and 19156108.

It is not a weakly prime, because it can be changed into another prime (19156133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9578069 + 9578070.

It is an arithmetic number, because the mean of its divisors is an integer number (9578070).

Almost surely, 2^19156139 is an apocalyptic number.

19156139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19156139 is an equidigital number, since it uses as much as digits as its factorization.

19156139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 35.

The square root of 19156139 is about 4376.7726694449. The cubic root of 19156139 is about 267.5691218003.

The spelling of 19156139 in words is "nineteen million, one hundred fifty-six thousand, one hundred thirty-nine".