162001561 has 4 divisors (see below), whose sum is σ = 162289872. Its totient is φ = 161713252.

The previous prime is 162001559. The next prime is 162001573. The reversal of 162001561 is 165100261.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165100261 = 67 ⋅2464183.

It is a cyclic number.

It is not a de Polignac number, because 162001561 - 2¹ = 162001559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162001261) 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, 143311 + ... + 144436.

It is an arithmetic number, because the mean of its divisors is an integer number (40572468).

Almost surely, 2^162001561 is an apocalyptic number.

It is an amenable number.

162001561 is a deficient number, since it is larger than the sum of its proper divisors (288311).

162001561 is an equidigital number, since it uses as much as digits as its factorization.

162001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288310.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 162001561 is about 12727.9833830815. The cubic root of 162001561 is about 545.1379287855.

The spelling of 162001561 in words is "one hundred sixty-two million, one thousand, five hundred sixty-one".