31216061 has 2 divisors, whose sum is σ = 31216062. Its totient is φ = 31216060.

The previous prime is 31216057. The next prime is 31216103. The reversal of 31216061 is 16061213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30591961 + 624100 = 5531^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 31216061 - 2² = 31216057 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31216001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15608030 + 15608031.

It is an arithmetic number, because the mean of its divisors is an integer number (15608031).

Almost surely, 2^31216061 is an apocalyptic number.

It is an amenable number.

31216061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31216061 is an equidigital number, since it uses as much as digits as its factorization.

31216061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31216061 is about 5587.1335226572. The cubic root of 31216061 is about 314.8661932742.

Adding to 31216061 its reverse (16061213), we get a palindrome (47277274).

The spelling of 31216061 in words is "thirty-one million, two hundred sixteen thousand, sixty-one".