288197981 has 4 divisors (see below), whose sum is σ = 300728352. Its totient is φ = 275667612.

The previous prime is 288197971. The next prime is 288197989. The reversal of 288197981 is 189791882.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-288197981 is a prime.

It is a super-2 number, since 2×288197981² = 166116152504952722, 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 (288197989) 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, 6265151 + ... + 6265196.

It is an arithmetic number, because the mean of its divisors is an integer number (75182088).

Almost surely, 2^288197981 is an apocalyptic number.

It is an amenable number.

288197981 is a deficient number, since it is larger than the sum of its proper divisors (12530371).

288197981 is a wasteful number, since it uses less digits than its factorization.

288197981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12530370.

The product of its digits is 580608, while the sum is 53.

The square root of 288197981 is about 16976.3948175106. The cubic root of 288197981 is about 660.5367389270.

The spelling of 288197981 in words is "two hundred eighty-eight million, one hundred ninety-seven thousand, nine hundred eighty-one".