91349569 has 4 divisors (see below), whose sum is σ = 91369044. Its totient is φ = 91330096.

The previous prime is 91349563. The next prime is 91349617. The reversal of 91349569 is 96594319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47789569 + 43560000 = 6913^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 91349569 - 2⁹ = 91349057 is a prime.

It is a super-2 number, since 2×91349569² = 16689487512971522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91349563) 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, 2079 + ... + 13675.

It is an arithmetic number, because the mean of its divisors is an integer number (22842261).

Almost surely, 2^91349569 is an apocalyptic number.

It is an amenable number.

91349569 is a deficient number, since it is larger than the sum of its proper divisors (19475).

91349569 is a wasteful number, since it uses less digits than its factorization.

91349569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19474.

The product of its digits is 262440, while the sum is 46.

The square root of 91349569 is about 9557.6968459980. The cubic root of 91349569 is about 450.3693576556.

The spelling of 91349569 in words is "ninety-one million, three hundred forty-nine thousand, five hundred sixty-nine".