319137649 has 2 divisors, whose sum is σ = 319137650. Its totient is φ = 319137648.

The previous prime is 319137647. The next prime is 319137761. The reversal of 319137649 is 946731913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255776049 + 63361600 = 15993^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 319137649 - 2¹ = 319137647 is a prime.

Together with 319137647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (319137647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159568824 + 159568825.

It is an arithmetic number, because the mean of its divisors is an integer number (159568825).

Almost surely, 2^319137649 is an apocalyptic number.

It is an amenable number.

319137649 is a deficient number, since it is larger than the sum of its proper divisors (1).

319137649 is an equidigital number, since it uses as much as digits as its factorization.

319137649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 319137649 is about 17864.4241161029. The cubic root of 319137649 is about 683.3754094786.

The spelling of 319137649 in words is "three hundred nineteen million, one hundred thirty-seven thousand, six hundred forty-nine".