313138649 has 2 divisors, whose sum is σ = 313138650. Its totient is φ = 313138648.

The previous prime is 313138633. The next prime is 313138667. The reversal of 313138649 is 946831313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304258249 + 8880400 = 17443^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 313138649 - 2⁴ = 313138633 is a prime.

It is not a weakly prime, because it can be changed into another prime (313188649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156569324 + 156569325.

It is an arithmetic number, because the mean of its divisors is an integer number (156569325).

Almost surely, 2^313138649 is an apocalyptic number.

It is an amenable number.

313138649 is a deficient number, since it is larger than the sum of its proper divisors (1).

313138649 is an equidigital number, since it uses as much as digits as its factorization.

313138649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 313138649 is about 17695.7240315281. The cubic root of 313138649 is about 679.0663722794.

The spelling of 313138649 in words is "three hundred thirteen million, one hundred thirty-eight thousand, six hundred forty-nine".