731667121 has 2 divisors, whose sum is σ = 731667122. Its totient is φ = 731667120.

The previous prime is 731667109. The next prime is 731667133. The reversal of 731667121 is 121766137.

It is a balanced prime because it is at equal distance from previous prime (731667109) and next prime (731667133).

It can be written as a sum of positive squares in only one way, i.e., 731161600 + 505521 = 27040^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 731667121 - 2⁵ = 731667089 is a prime.

It is not a weakly prime, because it can be changed into another prime (731667151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365833560 + 365833561.

It is an arithmetic number, because the mean of its divisors is an integer number (365833561).

Almost surely, 2^731667121 is an apocalyptic number.

It is an amenable number.

731667121 is a deficient number, since it is larger than the sum of its proper divisors (1).

731667121 is an equidigital number, since it uses as much as digits as its factorization.

731667121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 731667121 is about 27049.3460364571. The cubic root of 731667121 is about 901.0962448355.

The spelling of 731667121 in words is "seven hundred thirty-one million, six hundred sixty-seven thousand, one hundred twenty-one".