31536161 has 2 divisors, whose sum is σ = 31536162. Its totient is φ = 31536160.

The previous prime is 31536101. The next prime is 31536187. The reversal of 31536161 is 16163513.

It is an a-pointer prime, because the next prime (31536187) can be obtained adding 31536161 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 844561 = 5540^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 31536161 - 2⁶ = 31536097 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31536161.

It is not a weakly prime, because it can be changed into another prime (31536101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15768080 + 15768081.

It is an arithmetic number, because the mean of its divisors is an integer number (15768081).

Almost surely, 2^31536161 is an apocalyptic number.

It is an amenable number.

31536161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31536161 is an equidigital number, since it uses as much as digits as its factorization.

31536161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 31536161 is about 5615.7066340755. The cubic root of 31536161 is about 315.9387833401.

Adding to 31536161 its reverse (16163513), we get a palindrome (47699674).

The spelling of 31536161 in words is "thirty-one million, five hundred thirty-six thousand, one hundred sixty-one".