287120997 has 16 divisors (see below), whose sum is σ = 430752000. Its totient is φ = 188989632.

The previous prime is 287120969. The next prime is 287121047. The reversal of 287120997 is 799021782.

It is not a de Polignac number, because 287120997 - 2¹⁵ = 287088229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287120917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65172 + ... + 69437.

It is an arithmetic number, because the mean of its divisors is an integer number (26922000).

Almost surely, 2^287120997 is an apocalyptic number.

287120997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

287120997 is a deficient number, since it is larger than the sum of its proper divisors (143631003).

287120997 is a wasteful number, since it uses less digits than its factorization.

287120997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134697 (or 134691 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 287120997 is about 16944.6450833294. The cubic root of 287120997 is about 659.7129123304.

The spelling of 287120997 in words is "two hundred eighty-seven million, one hundred twenty thousand, nine hundred ninety-seven".