161402801 has 4 divisors (see below), whose sum is σ = 184460352. Its totient is φ = 138345252.

The previous prime is 161402797. The next prime is 161402821. The reversal of 161402801 is 108204161.

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: 108204161 = 13 ⋅8323397.

It is a cyclic number.

It is not a de Polignac number, because 161402801 - 2² = 161402797 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 (161402821) 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, 11528765 + ... + 11528778.

It is an arithmetic number, because the mean of its divisors is an integer number (46115088).

Almost surely, 2^161402801 is an apocalyptic number.

It is an amenable number.

161402801 is a deficient number, since it is larger than the sum of its proper divisors (23057551).

161402801 is an equidigital number, since it uses as much as digits as its factorization.

161402801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23057550.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 161402801 is about 12704.4402080532. The cubic root of 161402801 is about 544.4654872225.

Adding to 161402801 its reverse (108204161), we get a palindrome (269606962).

The spelling of 161402801 in words is "one hundred sixty-one million, four hundred two thousand, eight hundred one".