310138993 has 2 divisors, whose sum is σ = 310138994. Its totient is φ = 310138992.

The previous prime is 310138991. The next prime is 310138999. The reversal of 310138993 is 399831013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164019249 + 146119744 = 12807^2 + 12088^2 .

It is a cyclic number.

It is not a de Polignac number, because 310138993 - 2¹ = 310138991 is a prime.

Together with 310138991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (310138991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155069496 + 155069497.

It is an arithmetic number, because the mean of its divisors is an integer number (155069497).

Almost surely, 2^310138993 is an apocalyptic number.

It is an amenable number.

310138993 is a deficient number, since it is larger than the sum of its proper divisors (1).

310138993 is an equidigital number, since it uses as much as digits as its factorization.

310138993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 310138993 is about 17610.7635552806. The cubic root of 310138993 is about 676.8910796293.

The spelling of 310138993 in words is "three hundred ten million, one hundred thirty-eight thousand, nine hundred ninety-three".