287461981 has 8 divisors (see below), whose sum is σ = 300360384. Its totient is φ = 274596960.

The previous prime is 287461957. The next prime is 287461987. The reversal of 287461981 is 189164782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 287461981 - 2¹¹ = 287459933 is a prime.

It is a super-2 number, since 2×287461981² = 165268781040888722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287461987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10161 + ... + 26041.

It is an arithmetic number, because the mean of its divisors is an integer number (37545048).

Almost surely, 2^287461981 is an apocalyptic number.

It is an amenable number.

287461981 is a deficient number, since it is larger than the sum of its proper divisors (12898403).

287461981 is a wasteful number, since it uses less digits than its factorization.

287461981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16691.

The product of its digits is 193536, while the sum is 46.

The square root of 287461981 is about 16954.7038016003. The cubic root of 287461981 is about 659.9739666805.

The spelling of 287461981 in words is "two hundred eighty-seven million, four hundred sixty-one thousand, nine hundred eighty-one".