97191281 has 4 divisors (see below), whose sum is σ = 106026864. Its totient is φ = 88355700.

The previous prime is 97191277. The next prime is 97191299. The reversal of 97191281 is 18219179.

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 not a de Polignac number, because 97191281 - 2² = 97191277 is a prime.

It is a super-2 number, since 2×97191281² = 18892290204841922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97191221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4417775 + ... + 4417796.

It is an arithmetic number, because the mean of its divisors is an integer number (26506716).

Almost surely, 2^97191281 is an apocalyptic number.

It is an amenable number.

97191281 is a deficient number, since it is larger than the sum of its proper divisors (8835583).

97191281 is a wasteful number, since it uses less digits than its factorization.

97191281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8835582.

The product of its digits is 9072, while the sum is 38.

The square root of 97191281 is about 9858.5638406413. The cubic root of 97191281 is about 459.7719111815.

The spelling of 97191281 in words is "ninety-seven million, one hundred ninety-one thousand, two hundred eighty-one".