312221725 has 12 divisors (see below), whose sum is σ = 397619764. Its totient is φ = 243025920.

The previous prime is 312221669. The next prime is 312221771. The reversal of 312221725 is 527122213.

It can be written as a sum of positive squares in 6 ways, for example, as 558009 + 311663716 = 747^2 + 17654^2 .

It is not a de Polignac number, because 312221725 - 2⁷ = 312221597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312221725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167844 + ... + 169693.

Almost surely, 2^312221725 is an apocalyptic number.

It is an amenable number.

312221725 is a deficient number, since it is larger than the sum of its proper divisors (85398039).

312221725 is a wasteful number, since it uses less digits than its factorization.

312221725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337584 (or 337579 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 312221725 is about 17669.7969711030. The cubic root of 312221725 is about 678.4029164467.

Adding to 312221725 its reverse (527122213), we get a palindrome (839343938).

The spelling of 312221725 in words is "three hundred twelve million, two hundred twenty-one thousand, seven hundred twenty-five".