161987053 has 4 divisors (see below), whose sum is σ = 162024768. Its totient is φ = 161949340.

The previous prime is 161987047. The next prime is 161987057. The reversal of 161987053 is 350789161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161987053 - 2⁹ = 161986541 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161986997 and 161987015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161987057) 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, 11443 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (40506192).

Almost surely, 2^161987053 is an apocalyptic number.

It is an amenable number.

161987053 is a deficient number, since it is larger than the sum of its proper divisors (37715).

161987053 is an equidigital number, since it uses as much as digits as its factorization.

161987053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37714.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 161987053 is about 12727.4134450013. The cubic root of 161987053 is about 545.1216550798.

The spelling of 161987053 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, fifty-three".