287397157 has 2 divisors, whose sum is σ = 287397158. Its totient is φ = 287397156.

The previous prime is 287397113. The next prime is 287397161. The reversal of 287397157 is 751793782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256992961 + 30404196 = 16031^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 287397157 - 2¹¹ = 287395109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287397157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287397107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143698578 + 143698579.

It is an arithmetic number, because the mean of its divisors is an integer number (143698579).

Almost surely, 2^287397157 is an apocalyptic number.

It is an amenable number.

287397157 is a deficient number, since it is larger than the sum of its proper divisors (1).

287397157 is an equidigital number, since it uses as much as digits as its factorization.

287397157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 49.

The square root of 287397157 is about 16952.7920119371. The cubic root of 287397157 is about 659.9243538952.

The spelling of 287397157 in words is "two hundred eighty-seven million, three hundred ninety-seven thousand, one hundred fifty-seven".