287906149 has 2 divisors, whose sum is σ = 287906150. Its totient is φ = 287906148.

The previous prime is 287906147. The next prime is 287906191. The reversal of 287906149 is 941609782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205005124 + 82901025 = 14318^2 + 9105^2 .

It is a cyclic number.

It is not a de Polignac number, because 287906149 - 2¹ = 287906147 is a prime.

Together with 287906147, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 287906099 and 287906108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287906147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143953074 + 143953075.

It is an arithmetic number, because the mean of its divisors is an integer number (143953075).

Almost surely, 2^287906149 is an apocalyptic number.

It is an amenable number.

287906149 is a deficient number, since it is larger than the sum of its proper divisors (1).

287906149 is an equidigital number, since it uses as much as digits as its factorization.

287906149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 287906149 is about 16967.7974115676. The cubic root of 287906149 is about 660.3137083804.

The spelling of 287906149 in words is "two hundred eighty-seven million, nine hundred six thousand, one hundred forty-nine".