97820231 has 4 divisors (see below), whose sum is σ = 98998872. Its totient is φ = 96641592.

The previous prime is 97820209. The next prime is 97820237. The reversal of 97820231 is 13202879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13202879 = 3221 ⋅4099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97820231 is a prime.

It is a super-2 number, since 2×97820231² = 19137595185786722, 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 (97820237) 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, 589196 + ... + 589361.

It is an arithmetic number, because the mean of its divisors is an integer number (24749718).

Almost surely, 2^97820231 is an apocalyptic number.

97820231 is a deficient number, since it is larger than the sum of its proper divisors (1178641).

97820231 is a wasteful number, since it uses less digits than its factorization.

97820231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178640.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 97820231 is about 9890.4110632471. The cubic root of 97820231 is about 460.7615472927.

The spelling of 97820231 in words is "ninety-seven million, eight hundred twenty thousand, two hundred thirty-one".