731661061 has 2 divisors, whose sum is σ = 731661062. Its totient is φ = 731661060.

The previous prime is 731661059. The next prime is 731661067. The reversal of 731661061 is 160166137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473062500 + 258598561 = 21750^2 + 16081^2 .

It is an emirp because it is prime and its reverse (160166137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731661061 - 2¹ = 731661059 is a prime.

Together with 731661059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731661067) 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 as a sum of consecutive naturals, namely, 365830530 + 365830531.

It is an arithmetic number, because the mean of its divisors is an integer number (365830531).

Almost surely, 2^731661061 is an apocalyptic number.

It is an amenable number.

731661061 is a deficient number, since it is larger than the sum of its proper divisors (1).

731661061 is an equidigital number, since it uses as much as digits as its factorization.

731661061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 731661061 is about 27049.2340187296. The cubic root of 731661061 is about 901.0937570656.

The spelling of 731661061 in words is "seven hundred thirty-one million, six hundred sixty-one thousand, sixty-one".