214231987 has 2 divisors, whose sum is σ = 214231988. Its totient is φ = 214231986.

The previous prime is 214231957. The next prime is 214231991. The reversal of 214231987 is 789132412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214231987 is a prime.

It is not a weakly prime, because it can be changed into another prime (214231907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107115993 + 107115994.

It is an arithmetic number, because the mean of its divisors is an integer number (107115994).

Almost surely, 2^214231987 is an apocalyptic number.

214231987 is a deficient number, since it is larger than the sum of its proper divisors (1).

214231987 is an equidigital number, since it uses as much as digits as its factorization.

214231987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 214231987 is about 14636.6658430122. The cubic root of 214231987 is about 598.3584639540.

The spelling of 214231987 in words is "two hundred fourteen million, two hundred thirty-one thousand, nine hundred eighty-seven".