287561023 has 2 divisors, whose sum is σ = 287561024. Its totient is φ = 287561022.

The previous prime is 287561011. The next prime is 287561063. The reversal of 287561023 is 320165782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287561023 - 2¹⁷ = 287429951 is a prime.

It is equal to p_15614368 and since 287561023 and 15614368 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287561023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287561063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143780511 + 143780512.

It is an arithmetic number, because the mean of its divisors is an integer number (143780512).

Almost surely, 2^287561023 is an apocalyptic number.

287561023 is a deficient number, since it is larger than the sum of its proper divisors (1).

287561023 is an equidigital number, since it uses as much as digits as its factorization.

287561023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 287561023 is about 16957.6243324352. The cubic root of 287561023 is about 660.0497536720.

The spelling of 287561023 in words is "two hundred eighty-seven million, five hundred sixty-one thousand, twenty-three".