161131519 has 2 divisors, whose sum is σ = 161131520. Its totient is φ = 161131518.

The previous prime is 161131489. The next prime is 161131543. The reversal of 161131519 is 915131161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161131519 - 2⁷ = 161131391 is a prime.

It is a super-2 number, since 2×161131519² = 51926732830494722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161132519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80565759 + 80565760.

It is an arithmetic number, because the mean of its divisors is an integer number (80565760).

Almost surely, 2^161131519 is an apocalyptic number.

161131519 is a deficient number, since it is larger than the sum of its proper divisors (1).

161131519 is an equidigital number, since it uses as much as digits as its factorization.

161131519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 28.

The square root of 161131519 is about 12693.7590571115. The cubic root of 161131519 is about 544.1602746012.

The spelling of 161131519 in words is "one hundred sixty-one million, one hundred thirty-one thousand, five hundred nineteen".