162117561 has 4 divisors (see below), whose sum is σ = 216156752. Its totient is φ = 108078372.

The previous prime is 162117541. The next prime is 162117577. The reversal of 162117561 is 165711261.

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 not a de Polignac number, because 162117561 - 2¹³ = 162109369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (162117541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27019591 + ... + 27019596.

It is an arithmetic number, because the mean of its divisors is an integer number (54039188).

Almost surely, 2^162117561 is an apocalyptic number.

It is an amenable number.

162117561 is a deficient number, since it is larger than the sum of its proper divisors (54039191).

162117561 is an equidigital number, since it uses as much as digits as its factorization.

162117561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54039190.

The product of its digits is 2520, while the sum is 30.

The square root of 162117561 is about 12732.5394560551. The cubic root of 162117561 is about 545.2680117142.

The spelling of 162117561 in words is "one hundred sixty-two million, one hundred seventeen thousand, five hundred sixty-one".