97093597991 has 4 divisors (see below), whose sum is σ = 104562336312. Its totient is φ = 89624859672.

The previous prime is 97093597981. The next prime is 97093598003. The reversal of 97093597991 is 19979539079.

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 97093597991 - 2²⁶ = 97026489127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97093597901) 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, 3734369141 + ... + 3734369166.

It is an arithmetic number, because the mean of its divisors is an integer number (26140584078).

Almost surely, 2^97093597991 is an apocalyptic number.

97093597991 is a deficient number, since it is larger than the sum of its proper divisors (7468738321).

97093597991 is a wasteful number, since it uses less digits than its factorization.

97093597991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468738320.

The product of its (nonzero) digits is 43401015, while the sum is 68.

The spelling of 97093597991 in words is "ninety-seven billion, ninety-three million, five hundred ninety-seven thousand, nine hundred ninety-one".