91550069 has 8 divisors (see below), whose sum is σ = 98686392. Its totient is φ = 84427200.

The previous prime is 91550059. The next prime is 91550093. The reversal of 91550069 is 96005519.

It can be written as a sum of positive squares in 4 ways, for example, as 9375844 + 82174225 = 3062^2 + 9065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-91550069 is a prime.

It is a super-2 number, since 2×91550069² = 16762830267809522, 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 (91550009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14207 + ... + 19619.

It is an arithmetic number, because the mean of its divisors is an integer number (12335799).

Almost surely, 2^91550069 is an apocalyptic number.

It is an amenable number.

91550069 is a deficient number, since it is larger than the sum of its proper divisors (7136323).

91550069 is a wasteful number, since it uses less digits than its factorization.

91550069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6727.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 91550069 is about 9568.1800254803. The cubic root of 91550069 is about 450.6986169062.

The spelling of 91550069 in words is "ninety-one million, five hundred fifty thousand, sixty-nine".