31242461 has 2 divisors, whose sum is σ = 31242462. Its totient is φ = 31242460.

The previous prime is 31242457. The next prime is 31242499. The reversal of 31242461 is 16424213.

31242461 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29365561 + 1876900 = 5419^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 31242461 - 2² = 31242457 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 (31242661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15621230 + 15621231.

It is an arithmetic number, because the mean of its divisors is an integer number (15621231).

Almost surely, 2^31242461 is an apocalyptic number.

It is an amenable number.

31242461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31242461 is an equidigital number, since it uses as much as digits as its factorization.

31242461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 31242461 is about 5589.4955944164. The cubic root of 31242461 is about 314.9549309838.

Adding to 31242461 its reverse (16424213), we get a palindrome (47666674).

The spelling of 31242461 in words is "thirty-one million, two hundred forty-two thousand, four hundred sixty-one".