97991095 has 4 divisors (see below), whose sum is σ = 117589320. Its totient is φ = 78392872.

The previous prime is 97991057. The next prime is 97991119. The reversal of 97991095 is 59019979.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59019979 = 193 ⋅305803.

It is a cyclic number.

It is not a de Polignac number, because 97991095 - 2⁷ = 97990967 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9799105 + ... + 9799114.

It is an arithmetic number, because the mean of its divisors is an integer number (29397330).

Almost surely, 2^97991095 is an apocalyptic number.

97991095 is a deficient number, since it is larger than the sum of its proper divisors (19598225).

97991095 is a wasteful number, since it uses less digits than its factorization.

97991095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19598224.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 97991095 is about 9899.0451559734. The cubic root of 97991095 is about 461.0296641790.

The spelling of 97991095 in words is "ninety-seven million, nine hundred ninety-one thousand, ninety-five".