90685511 has 4 divisors (see below), whose sum is σ = 103640592. Its totient is φ = 77730432.

The previous prime is 90685501. The next prime is 90685541. The reversal of 90685511 is 11558609.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90685511 is a prime.

It is a super-2 number, since 2×90685511² = 16447723810662242, 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 (90685501) 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 3 ways as a sum of consecutive naturals, for example, 6477530 + ... + 6477543.

It is an arithmetic number, because the mean of its divisors is an integer number (25910148).

Almost surely, 2^90685511 is an apocalyptic number.

90685511 is a deficient number, since it is larger than the sum of its proper divisors (12955081).

90685511 is a wasteful number, since it uses less digits than its factorization.

90685511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12955080.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 90685511 is about 9522.8940454045. The cubic root of 90685511 is about 449.2753951605.

The spelling of 90685511 in words is "ninety million, six hundred eighty-five thousand, five hundred eleven".