97855691 has 4 divisors (see below), whose sum is σ = 97945992. Its totient is φ = 97765392.

The previous prime is 97855687. The next prime is 97855727. The reversal of 97855691 is 19655879.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97855691 - 2² = 97855687 is a prime.

It is a super-2 number, since 2×97855691² = 19151472522174962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97855391) 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, 43505 + ... + 45698.

It is an arithmetic number, because the mean of its divisors is an integer number (24486498).

Almost surely, 2^97855691 is an apocalyptic number.

97855691 is a deficient number, since it is larger than the sum of its proper divisors (90301).

97855691 is a wasteful number, since it uses less digits than its factorization.

97855691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90300.

The product of its digits is 680400, while the sum is 50.

The square root of 97855691 is about 9892.2035462277. The cubic root of 97855691 is about 460.8172161813.

The spelling of 97855691 in words is "ninety-seven million, eight hundred fifty-five thousand, six hundred ninety-one".