91669849 has 4 divisors (see below), whose sum is σ = 91692160. Its totient is φ = 91647540.

The previous prime is 91669843. The next prime is 91669861. The reversal of 91669849 is 94896619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94896619 = 47 ⋅2019077.

It is a cyclic number.

It is not a de Polignac number, because 91669849 - 2⁵ = 91669817 is a prime.

It is a super-2 number, since 2×91669849² = 16806722431365602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91669796 and 91669805.

It is not an unprimeable number, because it can be changed into a prime (91669843) 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, 3009 + ... + 13870.

It is an arithmetic number, because the mean of its divisors is an integer number (22923040).

Almost surely, 2^91669849 is an apocalyptic number.

It is an amenable number.

91669849 is a deficient number, since it is larger than the sum of its proper divisors (22311).

91669849 is a wasteful number, since it uses less digits than its factorization.

91669849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22310.

The product of its digits is 839808, while the sum is 52.

The square root of 91669849 is about 9574.4372680592. The cubic root of 91669849 is about 450.8950891911.

The spelling of 91669849 in words is "ninety-one million, six hundred sixty-nine thousand, eight hundred forty-nine".