310987 has 2 divisors, whose sum is σ = 310988. Its totient is φ = 310986.

The previous prime is 310969. The next prime is 310997. The reversal of 310987 is 789013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 310987 - 2¹¹ = 308939 is a prime.

It is not a weakly prime, because it can be changed into another prime (310927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155493 + 155494.

It is an arithmetic number, because the mean of its divisors is an integer number (155494).

2³¹⁰⁹⁸⁷ is an apocalyptic number.

310987 is a deficient number, since it is larger than the sum of its proper divisors (1).

310987 is an equidigital number, since it uses as much as digits as its factorization.

310987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 310987 is about 557.6620840617. The cubic root of 310987 is about 67.7507454882.

The spelling of 310987 in words is "three hundred ten thousand, nine hundred eighty-seven".