102722161 has 4 divisors (see below), whose sum is σ = 104169024. Its totient is φ = 101275300.

The previous prime is 102722159. The next prime is 102722167. The reversal of 102722161 is 161227201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161227201 = 17 ⋅9483953.

It is a cyclic number.

It is not a de Polignac number, because 102722161 - 2¹ = 102722159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102722167) 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, 723325 + ... + 723466.

It is an arithmetic number, because the mean of its divisors is an integer number (26042256).

Almost surely, 2^102722161 is an apocalyptic number.

It is an amenable number.

102722161 is a deficient number, since it is larger than the sum of its proper divisors (1446863).

102722161 is an equidigital number, since it uses as much as digits as its factorization.

102722161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446862.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 102722161 is about 10135.1941767289. The cubic root of 102722161 is about 468.3329518226.

Adding to 102722161 its reverse (161227201), we get a palindrome (263949362).

The spelling of 102722161 in words is "one hundred two million, seven hundred twenty-two thousand, one hundred sixty-one".