91513669 has 24 divisors (see below), whose sum is σ = 107081352. Its totient is φ = 77875200.

The previous prime is 91513663. The next prime is 91513673. The reversal of 91513669 is 96631519.

It can be written as a sum of positive squares in 12 ways, for example, as 9828225 + 81685444 = 3135^2 + 9038^2 .

It is not a de Polignac number, because 91513669 - 2⁹ = 91513157 is a prime.

It is a super-2 number, since 2×91513669² = 16749503227683122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91513663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151969 + ... + 152569.

It is an arithmetic number, because the mean of its divisors is an integer number (4461723).

Almost surely, 2^91513669 is an apocalyptic number.

It is an amenable number.

91513669 is a deficient number, since it is larger than the sum of its proper divisors (15567683).

91513669 is a wasteful number, since it uses less digits than its factorization.

91513669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 684 counting only the distinct ones).

The product of its digits is 43740, while the sum is 40.

The square root of 91513669 is about 9566.2776982482. The cubic root of 91513669 is about 450.6388769025.

The spelling of 91513669 in words is "ninety-one million, five hundred thirteen thousand, six hundred sixty-nine".