161055131 has 4 divisors (see below), whose sum is σ = 168057552. Its totient is φ = 154052712.

The previous prime is 161055121. The next prime is 161055133. The reversal of 161055131 is 131550161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131550161 = 73 ⋅1802057.

It is not a de Polignac number, because 161055131 - 2¹⁴ = 161038747 is a prime.

It is a super-2 number, since 2×161055131² = 51877510442854322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 7002397 = 161055131 / (1 + 6 + 1 + 0 + 5 + 5 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161055097 and 161055106.

It is not an unprimeable number, because it can be changed into a prime (161055133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501176 + ... + 3501221.

It is an arithmetic number, because the mean of its divisors is an integer number (42014388).

Almost surely, 2^161055131 is an apocalyptic number.

161055131 is a deficient number, since it is larger than the sum of its proper divisors (7002421).

161055131 is an equidigital number, since it uses as much as digits as its factorization.

161055131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002420.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 161055131 is about 12690.7498202431. The cubic root of 161055131 is about 544.0742705600.

The spelling of 161055131 in words is "one hundred sixty-one million, fifty-five thousand, one hundred thirty-one".