91129197 has 16 divisors (see below), whose sum is σ = 134248320. Its totient is φ = 54692352.

The previous prime is 91129177. The next prime is 91129201. The reversal of 91129197 is 79192119.

It is not a de Polignac number, because 91129197 - 2¹⁸ = 90867053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91129117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37672 + ... + 40017.

It is an arithmetic number, because the mean of its divisors is an integer number (8390520).

Almost surely, 2^91129197 is an apocalyptic number.

It is an amenable number.

91129197 is a deficient number, since it is larger than the sum of its proper divisors (43119123).

91129197 is a wasteful number, since it uses less digits than its factorization.

91129197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77732.

The product of its digits is 10206, while the sum is 39.

The square root of 91129197 is about 9546.1613751287. The cubic root of 91129197 is about 450.0069085359.

The spelling of 91129197 in words is "ninety-one million, one hundred twenty-nine thousand, one hundred ninety-seven".