731690161 has 2 divisors, whose sum is σ = 731690162. Its totient is φ = 731690160.

The previous prime is 731690159. The next prime is 731690177. The reversal of 731690161 is 161096137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673091136 + 58599025 = 25944^2 + 7655^2 .

It is a cyclic number.

It is not a de Polignac number, because 731690161 - 2¹ = 731690159 is a prime.

Together with 731690159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (731690131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365845080 + 365845081.

It is an arithmetic number, because the mean of its divisors is an integer number (365845081).

Almost surely, 2^731690161 is an apocalyptic number.

It is an amenable number.

731690161 is a deficient number, since it is larger than the sum of its proper divisors (1).

731690161 is an equidigital number, since it uses as much as digits as its factorization.

731690161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 731690161 is about 27049.7719214044. The cubic root of 731690161 is about 901.1057031620.

The spelling of 731690161 in words is "seven hundred thirty-one million, six hundred ninety thousand, one hundred sixty-one".