731088161 has 4 divisors (see below), whose sum is σ = 731163312. Its totient is φ = 731013012.

The previous prime is 731088151. The next prime is 731088167. The reversal of 731088161 is 161880137.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 161880137 = 17 ⋅9522361.

It is a cyclic number.

It is not a de Polignac number, because 731088161 - 2¹⁴ = 731071777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731088167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20351 + ... + 43316.

It is an arithmetic number, because the mean of its divisors is an integer number (182790828).

Almost surely, 2^731088161 is an apocalyptic number.

It is an amenable number.

731088161 is a deficient number, since it is larger than the sum of its proper divisors (75151).

731088161 is a wasteful number, since it uses less digits than its factorization.

731088161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75150.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 731088161 is about 27038.6419962246. The cubic root of 731088161 is about 900.8585063283.

The spelling of 731088161 in words is "seven hundred thirty-one million, eighty-eight thousand, one hundred sixty-one".