729145631 has 2 divisors, whose sum is σ = 729145632. Its totient is φ = 729145630.

The previous prime is 729145603. The next prime is 729145673. The reversal of 729145631 is 136541927.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729145631 is a prime.

It is a super-2 number, since 2×729145631² = 1063306702412776322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729145601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364572815 + 364572816.

It is an arithmetic number, because the mean of its divisors is an integer number (364572816).

Almost surely, 2^729145631 is an apocalyptic number.

729145631 is a deficient number, since it is larger than the sum of its proper divisors (1).

729145631 is an equidigital number, since it uses as much as digits as its factorization.

729145631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 729145631 is about 27002.6967356966. The cubic root of 729145631 is about 900.0599264624.

The spelling of 729145631 in words is "seven hundred twenty-nine million, one hundred forty-five thousand, six hundred thirty-one".