287490161 has 4 divisors (see below), whose sum is σ = 328560192. Its totient is φ = 246420132.

The previous prime is 287490149. The next prime is 287490163. The reversal of 287490161 is 161094782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 287490161 - 2¹⁴ = 287473777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287490163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20535005 + ... + 20535018.

It is an arithmetic number, because the mean of its divisors is an integer number (82140048).

Almost surely, 2^287490161 is an apocalyptic number.

It is an amenable number.

287490161 is a deficient number, since it is larger than the sum of its proper divisors (41070031).

287490161 is an equidigital number, since it uses as much as digits as its factorization.

287490161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41070030.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 287490161 is about 16955.5348190495. The cubic root of 287490161 is about 659.9955318032.

The spelling of 287490161 in words is "two hundred eighty-seven million, four hundred ninety thousand, one hundred sixty-one".