91655197 has 4 divisors (see below), whose sum is σ = 91792060. Its totient is φ = 91518336.

The previous prime is 91655173. The next prime is 91655209. The reversal of 91655197 is 79155619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79155619 = 101 ⋅783719.

It can be written as a sum of positive squares in 2 ways, for example, as 44169316 + 47485881 = 6646^2 + 6891^2 .

It is a cyclic number.

It is not a de Polignac number, because 91655197 - 2¹⁵ = 91622429 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 (91625197) 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, 67422 + ... + 68767.

It is an arithmetic number, because the mean of its divisors is an integer number (22948015).

Almost surely, 2^91655197 is an apocalyptic number.

It is an amenable number.

91655197 is a deficient number, since it is larger than the sum of its proper divisors (136863).

91655197 is a wasteful number, since it uses less digits than its factorization.

91655197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136862.

The product of its digits is 85050, while the sum is 43.

The square root of 91655197 is about 9573.6720750191. The cubic root of 91655197 is about 450.8710650547.

The spelling of 91655197 in words is "ninety-one million, six hundred fifty-five thousand, one hundred ninety-seven".