91656009 has 16 divisors (see below), whose sum is σ = 136704000. Its totient is φ = 60691248.

The previous prime is 91656007. The next prime is 91656011. The reversal of 91656009 is 90065619.

91656009 is a `hidden beast` number, since 91 + 6 + 560 + 0 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (91656007) and next prime (91656011).

It is not a de Polignac number, because 91656009 - 2¹ = 91656007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91656007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7369 + ... + 15414.

It is an arithmetic number, because the mean of its divisors is an integer number (8544000).

Almost surely, 2^91656009 is an apocalyptic number.

It is an amenable number.

91656009 is a deficient number, since it is larger than the sum of its proper divisors (45047991).

91656009 is a wasteful number, since it uses less digits than its factorization.

91656009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22941 (or 22935 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 91656009 is about 9573.7144828953. The cubic root of 91656009 is about 450.8723965167.

It can be divided in two parts, 91 and 656009, that added together give a square (656100 = 810²).

The spelling of 91656009 in words is "ninety-one million, six hundred fifty-six thousand, nine".