161210001 has 4 divisors (see below), whose sum is σ = 214946672. Its totient is φ = 107473332.

The previous prime is 161209969. The next prime is 161210011. The reversal of 161210001 is 100012161.

It is a happy number.

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 161210001 - 2⁵ = 161209969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161210011) 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, 26868331 + ... + 26868336.

It is an arithmetic number, because the mean of its divisors is an integer number (53736668).

Almost surely, 2^161210001 is an apocalyptic number.

It is an amenable number.

161210001 is a deficient number, since it is larger than the sum of its proper divisors (53736671).

161210001 is an equidigital number, since it uses as much as digits as its factorization.

161210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53736670.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 161210001 is about 12696.8500424318. The cubic root of 161210001 is about 544.2486079393.

Adding to 161210001 its reverse (100012161), we get a palindrome (261222162).

The spelling of 161210001 in words is "one hundred sixty-one million, two hundred ten thousand, one".