31130461 has 2 divisors, whose sum is σ = 31130462. Its totient is φ = 31130460.

The previous prime is 31130459. The next prime is 31130507. The reversal of 31130461 is 16403113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 9647236 = 4635^2 + 3106^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130461 - 2¹ = 31130459 is a prime.

Together with 31130459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31130441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565230 + 15565231.

It is an arithmetic number, because the mean of its divisors is an integer number (15565231).

Almost surely, 2^31130461 is an apocalyptic number.

It is an amenable number.

31130461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31130461 is an equidigital number, since it uses as much as digits as its factorization.

31130461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31130461 is about 5579.4678061622. The cubic root of 31130461 is about 314.5781234034.

Adding to 31130461 its reverse (16403113), we get a palindrome (47533574).

The spelling of 31130461 in words is "thirty-one million, one hundred thirty thousand, four hundred sixty-one".