97881819 has 8 divisors (see below), whose sum is σ = 149153280. Its totient is φ = 55932456.

The previous prime is 97881779. The next prime is 97881829. The reversal of 97881819 is 91818879.

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

It is not a de Polignac number, because 97881819 - 2¹² = 97877723 is a prime.

It is a super-2 number, since 2×97881819² = 19161700981497522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (97881829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330499 + ... + 2330540.

It is an arithmetic number, because the mean of its divisors is an integer number (18644160).

Almost surely, 2^97881819 is an apocalyptic number.

97881819 is a deficient number, since it is larger than the sum of its proper divisors (51271461).

97881819 is a wasteful number, since it uses less digits than its factorization.

97881819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661049.

The product of its digits is 290304, while the sum is 51.

The square root of 97881819 is about 9893.5240940728. The cubic root of 97881819 is about 460.8582260965.

The spelling of 97881819 in words is "ninety-seven million, eight hundred eighty-one thousand, eight hundred nineteen".