91424869 has 2 divisors, whose sum is σ = 91424870. Its totient is φ = 91424868.

The previous prime is 91424867. The next prime is 91424881. The reversal of 91424869 is 96842419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71622369 + 19802500 = 8463^2 + 4450^2 .

It is a cyclic number.

It is not a de Polignac number, because 91424869 - 2¹ = 91424867 is a prime.

It is a super-2 number, since 2×91424869² = 16717013343334322, which contains 22 as substring.

Together with 91424867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91424863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45712434 + 45712435.

It is an arithmetic number, because the mean of its divisors is an integer number (45712435).

Almost surely, 2^91424869 is an apocalyptic number.

It is an amenable number.

91424869 is a deficient number, since it is larger than the sum of its proper divisors (1).

91424869 is an equidigital number, since it uses as much as digits as its factorization.

91424869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 91424869 is about 9561.6352680909. The cubic root of 91424869 is about 450.4930710607.

The spelling of 91424869 in words is "ninety-one million, four hundred twenty-four thousand, eight hundred sixty-nine".