31436161 has 2 divisors, whose sum is σ = 31436162. Its totient is φ = 31436160.

The previous prime is 31436137. The next prime is 31436189. The reversal of 31436161 is 16163413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 11943936 = 4415^2 + 3456^2 .

It is a cyclic number.

It is not a de Polignac number, because 31436161 - 2⁵ = 31436129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31436761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15718080 + 15718081.

It is an arithmetic number, because the mean of its divisors is an integer number (15718081).

Almost surely, 2^31436161 is an apocalyptic number.

It is an amenable number.

31436161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31436161 is an equidigital number, since it uses as much as digits as its factorization.

31436161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 31436161 is about 5606.7959656117. The cubic root of 31436161 is about 315.6044863444.

Adding to 31436161 its reverse (16163413), we get a palindrome (47599574).

The spelling of 31436161 in words is "thirty-one million, four hundred thirty-six thousand, one hundred sixty-one".