97821231 has 8 divisors (see below), whose sum is σ = 136099200. Its totient is φ = 62378712.

The previous prime is 97821221. The next prime is 97821313. The reversal of 97821231 is 13212879.

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

It is not a de Polignac number, because 97821231 - 2⁶ = 97821167 is a prime.

It is a super-2 number, since 2×97821231² = 19137986468710722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 97821192 and 97821201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97821221) 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, 708781 + ... + 708918.

It is an arithmetic number, because the mean of its divisors is an integer number (17012400).

Almost surely, 2^97821231 is an apocalyptic number.

97821231 is a deficient number, since it is larger than the sum of its proper divisors (38277969).

97821231 is a wasteful number, since it uses less digits than its factorization.

97821231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417725.

The product of its digits is 6048, while the sum is 33.

The square root of 97821231 is about 9890.4616171340. The cubic root of 97821231 is about 460.7631173837.

The spelling of 97821231 in words is "ninety-seven million, eight hundred twenty-one thousand, two hundred thirty-one".