97855213 has 4 divisors (see below), whose sum is σ = 103611420. Its totient is φ = 92099008.

The previous prime is 97855211. The next prime is 97855223. The reversal of 97855213 is 31255879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31255879 = 149 ⋅209771.

It can be written as a sum of positive squares in 2 ways, for example, as 89075844 + 8779369 = 9438^2 + 2963^2 .

It is a cyclic number.

It is not a de Polignac number, because 97855213 - 2¹ = 97855211 is a prime.

It is a super-2 number, since 2×97855213² = 19151285422550738, 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 (97855211) 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, 2878078 + ... + 2878111.

It is an arithmetic number, because the mean of its divisors is an integer number (25902855).

Almost surely, 2^97855213 is an apocalyptic number.

It is an amenable number.

97855213 is a deficient number, since it is larger than the sum of its proper divisors (5756207).

97855213 is a wasteful number, since it uses less digits than its factorization.

97855213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5756206.

The product of its digits is 75600, while the sum is 40.

The square root of 97855213 is about 9892.1793857572. The cubic root of 97855213 is about 460.8164658553.

The spelling of 97855213 in words is "ninety-seven million, eight hundred fifty-five thousand, two hundred thirteen".