91206961 has 4 divisors (see below), whose sum is σ = 93672052. Its totient is φ = 88741872.

The previous prime is 91206953. The next prime is 91207007. The reversal of 91206961 is 16960219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16960219 = 641 ⋅26459.

It can be written as a sum of positive squares in 2 ways, for example, as 83539600 + 7667361 = 9140^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 91206961 - 2³ = 91206953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91206761) 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, 1232490 + ... + 1232563.

It is an arithmetic number, because the mean of its divisors is an integer number (23418013).

Almost surely, 2^91206961 is an apocalyptic number.

It is an amenable number.

91206961 is a deficient number, since it is larger than the sum of its proper divisors (2465091).

91206961 is a wasteful number, since it uses less digits than its factorization.

91206961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465090.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 91206961 is about 9550.2335573535. The cubic root of 91206961 is about 450.1348747974.

The spelling of 91206961 in words is "ninety-one million, two hundred six thousand, nine hundred sixty-one".