31025161 has 2 divisors, whose sum is σ = 31025162. Its totient is φ = 31025160.

The previous prime is 31025147. The next prime is 31025171. The reversal of 31025161 is 16152013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30869136 + 156025 = 5556^2 + 395^2 .

It is an emirp because it is prime and its reverse (16152013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31025161 - 2¹³ = 31016969 is a prime.

It is not a weakly prime, because it can be changed into another prime (31025171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15512580 + 15512581.

It is an arithmetic number, because the mean of its divisors is an integer number (15512581).

Almost surely, 2^31025161 is an apocalyptic number.

It is an amenable number.

31025161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31025161 is an equidigital number, since it uses as much as digits as its factorization.

31025161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 31025161 is about 5570.0234290351. The cubic root of 31025161 is about 314.2230318026.

Adding to 31025161 its reverse (16152013), we get a palindrome (47177174).

The spelling of 31025161 in words is "thirty-one million, twenty-five thousand, one hundred sixty-one".