31729097 has 2 divisors, whose sum is σ = 31729098. Its totient is φ = 31729096.

The previous prime is 31729081. The next prime is 31729127. The reversal of 31729097 is 79092713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 1048576 = 5539^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 31729097 - 2⁴ = 31729081 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31729097.

It is not a weakly prime, because it can be changed into another prime (31729037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15864548 + 15864549.

It is an arithmetic number, because the mean of its divisors is an integer number (15864549).

Almost surely, 2^31729097 is an apocalyptic number.

It is an amenable number.

31729097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31729097 is an equidigital number, since it uses as much as digits as its factorization.

31729097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 31729097 is about 5632.8586880908. The cubic root of 31729097 is about 316.5817709018.

The spelling of 31729097 in words is "thirty-one million, seven hundred twenty-nine thousand, ninety-seven".