331712729 has 2 divisors, whose sum is σ = 331712730. Its totient is φ = 331712728.

The previous prime is 331712671. The next prime is 331712747. The reversal of 331712729 is 927217133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257666704 + 74046025 = 16052^2 + 8605^2 .

It is a cyclic number.

It is not a de Polignac number, because 331712729 - 2¹⁶ = 331647193 is a prime.

It is a super-2 number, since 2×331712729² = 220066669161254882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331712429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165856364 + 165856365.

It is an arithmetic number, because the mean of its divisors is an integer number (165856365).

Almost surely, 2^331712729 is an apocalyptic number.

It is an amenable number.

331712729 is a deficient number, since it is larger than the sum of its proper divisors (1).

331712729 is an equidigital number, since it uses as much as digits as its factorization.

331712729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 331712729 is about 18212.9824301238. The cubic root of 331712729 is about 692.2357841151.

The spelling of 331712729 in words is "three hundred thirty-one million, seven hundred twelve thousand, seven hundred twenty-nine".