31506061 has 2 divisors, whose sum is σ = 31506062. Its totient is φ = 31506060.

The previous prime is 31506031. The next prime is 31506071. The reversal of 31506061 is 16060513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 6405961 = 5010^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 31506061 - 2⁵ = 31506029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31506031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15753030 + 15753031.

It is an arithmetic number, because the mean of its divisors is an integer number (15753031).

Almost surely, 2^31506061 is an apocalyptic number.

It is an amenable number.

31506061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31506061 is an equidigital number, since it uses as much as digits as its factorization.

31506061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 31506061 is about 5613.0260109855. The cubic root of 31506061 is about 315.8382343804.

Adding to 31506061 its reverse (16060513), we get a palindrome (47566574).

The spelling of 31506061 in words is "thirty-one million, five hundred six thousand, sixty-one".