203415161 has 4 divisors (see below), whose sum is σ = 203744400. Its totient is φ = 203085924.

The previous prime is 203415143. The next prime is 203415167. The reversal of 203415161 is 161514302.

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: 161514302 = 2 ⋅80757151.

It is a cyclic number.

It is not a de Polignac number, because 203415161 - 2¹⁰ = 203414137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203415167) 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, 163691 + ... + 164928.

It is an arithmetic number, because the mean of its divisors is an integer number (50936100).

Almost surely, 2^203415161 is an apocalyptic number.

It is an amenable number.

203415161 is a deficient number, since it is larger than the sum of its proper divisors (329239).

203415161 is an equidigital number, since it uses as much as digits as its factorization.

203415161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329238.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 203415161 is about 14262.3687022878. The cubic root of 203415161 is about 588.1134426023.

Adding to 203415161 its reverse (161514302), we get a palindrome (364929463).

The spelling of 203415161 in words is "two hundred three million, four hundred fifteen thousand, one hundred sixty-one".