161522019 has 20 divisors (see below), whose sum is σ = 241726056. Its totient is φ = 107485056.

The previous prime is 161522017. The next prime is 161522027. The reversal of 161522019 is 910225161.

It is not a de Polignac number, because 161522019 - 2¹ = 161522017 is a prime.

It is a super-2 number, since 2×161522019² = 52178725243672722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 161521983 and 161522001.

It is not an unprimeable number, because it can be changed into a prime (161522017) 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 in 19 ways as a sum of consecutive naturals, for example, 53032 + ... + 55994.

Almost surely, 2^161522019 is an apocalyptic number.

161522019 is a deficient number, since it is larger than the sum of its proper divisors (80204037).

161522019 is an equidigital number, since it uses as much as digits as its factorization.

161522019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648 (or 3639 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161522019 is about 12709.1313235799. The cubic root of 161522019 is about 544.5995082576.

The spelling of 161522019 in words is "one hundred sixty-one million, five hundred twenty-two thousand, nineteen".