97149191 has 4 divisors (see below), whose sum is σ = 97225392. Its totient is φ = 97072992.

The previous prime is 97149187. The next prime is 97149197. The reversal of 97149191 is 19194179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19194179 = 4013 ⋅4783.

It is a cyclic number.

It is not a de Polignac number, because 97149191 - 2² = 97149187 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 (97149197) 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, 36155 + ... + 38748.

It is an arithmetic number, because the mean of its divisors is an integer number (24306348).

Almost surely, 2^97149191 is an apocalyptic number.

97149191 is a deficient number, since it is larger than the sum of its proper divisors (76201).

97149191 is a wasteful number, since it uses less digits than its factorization.

97149191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76200.

The product of its digits is 20412, while the sum is 41.

The square root of 97149191 is about 9856.4289172093. The cubic root of 97149191 is about 459.7055314483.

The spelling of 97149191 in words is "ninety-seven million, one hundred forty-nine thousand, one hundred ninety-one".