312303661 has 2 divisors, whose sum is σ = 312303662. Its totient is φ = 312303660.

The previous prime is 312303619. The next prime is 312303679. The reversal of 312303661 is 166303213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235039561 + 77264100 = 15331^2 + 8790^2 .

It is an emirp because it is prime and its reverse (166303213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312303661 - 2¹³ = 312295469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312303161) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156151830 + 156151831.

It is an arithmetic number, because the mean of its divisors is an integer number (156151831).

Almost surely, 2^312303661 is an apocalyptic number.

It is an amenable number.

312303661 is a deficient number, since it is larger than the sum of its proper divisors (1).

312303661 is an equidigital number, since it uses as much as digits as its factorization.

312303661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 312303661 is about 17672.1153515927. The cubic root of 312303661 is about 678.4622554305.

Adding to 312303661 its reverse (166303213), we get a palindrome (478606874).

The spelling of 312303661 in words is "three hundred twelve million, three hundred three thousand, six hundred sixty-one".