31105457 has 2 divisors, whose sum is σ = 31105458. Its totient is φ = 31105456.

The previous prime is 31105423. The next prime is 31105463. The reversal of 31105457 is 75450113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24960016 + 6145441 = 4996^2 + 2479^2 .

It is an emirp because it is prime and its reverse (75450113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31105457 - 2⁸ = 31105201 is a prime.

It is not a weakly prime, because it can be changed into another prime (31105057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15552728 + 15552729.

It is an arithmetic number, because the mean of its divisors is an integer number (15552729).

Almost surely, 2^31105457 is an apocalyptic number.

It is an amenable number.

31105457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31105457 is an equidigital number, since it uses as much as digits as its factorization.

31105457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 31105457 is about 5577.2266405446. The cubic root of 31105457 is about 314.4938777482.

The spelling of 31105457 in words is "thirty-one million, one hundred five thousand, four hundred fifty-seven".