312616991 has 2 divisors, whose sum is σ = 312616992. Its totient is φ = 312616990.

The previous prime is 312616979. The next prime is 312617003. The reversal of 312616991 is 199616213.

It is a balanced prime because it is at equal distance from previous prime (312616979) and next prime (312617003).

It is an emirp because it is prime and its reverse (199616213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312616991 - 2¹⁰ = 312615967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312616901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156308495 + 156308496.

It is an arithmetic number, because the mean of its divisors is an integer number (156308496).

Almost surely, 2^312616991 is an apocalyptic number.

312616991 is a deficient number, since it is larger than the sum of its proper divisors (1).

312616991 is an equidigital number, since it uses as much as digits as its factorization.

312616991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 312616991 is about 17680.9782252001. The cubic root of 312616991 is about 678.6890768983.

The spelling of 312616991 in words is "three hundred twelve million, six hundred sixteen thousand, nine hundred ninety-one".