161156519 has 2 divisors, whose sum is σ = 161156520. Its totient is φ = 161156518.

The previous prime is 161156491. The next prime is 161156531. The reversal of 161156519 is 915651161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161156519 - 2¹⁶ = 161090983 is a prime.

It is a super-2 number, since 2×161156519² = 51942847232394722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161156539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80578259 + 80578260.

It is an arithmetic number, because the mean of its divisors is an integer number (80578260).

Almost surely, 2^161156519 is an apocalyptic number.

161156519 is a deficient number, since it is larger than the sum of its proper divisors (1).

161156519 is an equidigital number, since it uses as much as digits as its factorization.

161156519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 35.

The square root of 161156519 is about 12694.7437547987. The cubic root of 161156519 is about 544.1884158021.

The spelling of 161156519 in words is "one hundred sixty-one million, one hundred fifty-six thousand, five hundred nineteen".