91872269 has 2 divisors, whose sum is σ = 91872270. Its totient is φ = 91872268.

The previous prime is 91872259. The next prime is 91872293. The reversal of 91872269 is 96227819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69923044 + 21949225 = 8362^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 91872269 - 2⁸ = 91872013 is a prime.

It is a super-2 number, since 2×91872269² = 16881027622416722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91872259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45936134 + 45936135.

It is an arithmetic number, because the mean of its divisors is an integer number (45936135).

Almost surely, 2^91872269 is an apocalyptic number.

It is an amenable number.

91872269 is a deficient number, since it is larger than the sum of its proper divisors (1).

91872269 is an equidigital number, since it uses as much as digits as its factorization.

91872269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 91872269 is about 9585.0022952527. The cubic root of 91872269 is about 451.2267252673.

Subtracting from 91872269 its sum of digits (44), we obtain a square (91872225 = 9585²).

The spelling of 91872269 in words is "ninety-one million, eight hundred seventy-two thousand, two hundred sixty-nine".