91673261 has 2 divisors, whose sum is σ = 91673262. Its totient is φ = 91673260.

The previous prime is 91673237. The next prime is 91673273. The reversal of 91673261 is 16237619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58828900 + 32844361 = 7670^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 91673261 - 2¹⁰ = 91672237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91673221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45836630 + 45836631.

It is an arithmetic number, because the mean of its divisors is an integer number (45836631).

Almost surely, 2^91673261 is an apocalyptic number.

It is an amenable number.

91673261 is a deficient number, since it is larger than the sum of its proper divisors (1).

91673261 is an equidigital number, since it uses as much as digits as its factorization.

91673261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 91673261 is about 9574.6154491969. The cubic root of 91673261 is about 450.9006833058.

The spelling of 91673261 in words is "ninety-one million, six hundred seventy-three thousand, two hundred sixty-one".