161156071 has 4 divisors (see below), whose sum is σ = 161202312. Its totient is φ = 161109832.

The previous prime is 161156063. The next prime is 161156089. The reversal of 161156071 is 170651161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170651161 = 1009 ⋅169129.

It is a cyclic number.

It is not a de Polignac number, because 161156071 - 2³ = 161156063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161156371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17425 + ... + 25018.

It is an arithmetic number, because the mean of its divisors is an integer number (40300578).

Almost surely, 2^161156071 is an apocalyptic number.

161156071 is a deficient number, since it is larger than the sum of its proper divisors (46241).

161156071 is an equidigital number, since it uses as much as digits as its factorization.

161156071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46240.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 161156071 is about 12694.7261096882. The cubic root of 161156071 is about 544.1879115374.

The spelling of 161156071 in words is "one hundred sixty-one million, one hundred fifty-six thousand, seventy-one".