90651709 has 4 divisors (see below), whose sum is σ = 93777660. Its totient is φ = 87525760.

The previous prime is 90651707. The next prime is 90651713. The reversal of 90651709 is 90715609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90715609 = 113 ⋅802793.

It can be written as a sum of positive squares in 2 ways, for example, as 64160100 + 26491609 = 8010^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 90651709 - 2¹ = 90651707 is a prime.

It is a super-3 number, since 3×90651709³ (a number of 25 digits) contains 333 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 (90651707) 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, 1562932 + ... + 1562989.

It is an arithmetic number, because the mean of its divisors is an integer number (23444415).

Almost surely, 2^90651709 is an apocalyptic number.

It is an amenable number.

90651709 is a deficient number, since it is larger than the sum of its proper divisors (3125951).

90651709 is a wasteful number, since it uses less digits than its factorization.

90651709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125950.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 90651709 is about 9521.1191043910. The cubic root of 90651709 is about 449.2195674471.

The spelling of 90651709 in words is "ninety million, six hundred fifty-one thousand, seven hundred nine".